Get rid of the unused HAVE_SIG_ATOMIC_T et. al.

It was added in 2006 but I see no evidence it was ever used.

configure: tweak nghttp2 library name fix

commit 29c7cf79e8b44cf (shipped in 7.78.0) introduced a problem by
assuming that LIB_H2 does not have any leading whitespace. At least
Open

configure: tweak nghttp2 library name fix

commit 29c7cf79e8b44cf (shipped in 7.78.0) introduced a problem by
assuming that LIB_H2 does not have any leading whitespace. At least
OpenBSD's native pkg-config can produce such whitespace, though:

$ pkg-config --libs-only-l libnghttp2
-lnghttp2

As a result, the configure check for libnghttp2 will erroneously fail.

Bug: https://curl.se/mail/lib-2021-07/0050.html
Closes #7472

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configure: fix nghttp2 library name for static builds

Don't hardcode the nghttp2 library name,
because it can vary, be "nghttp2_static" for example.

Fixes https://github.com/cur

configure: fix nghttp2 library name for static builds

Don't hardcode the nghttp2 library name,
because it can vary, be "nghttp2_static" for example.

Fixes https://github.com/curl/curl/issues/7367
Closes https://github.com/curl/curl/pull/7368

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configure/cmake: remove checks for unused gethostbyaddr and gethostbyaddr_r

Closes #7276

configure/cmake: remove checks for unused inet_ntoa and inet_ntoa_r

Closes #7276

configure: remove unused check for gai_strerror

Closes #7276

configure/cmake: remove unused define HAVE_FREEIFADDRS

Closes #7276

configure/cmake: remove checks for unused sgtty.h

Closes #7276

configure/cmake: remove checks for unused getservbyport_r

Closes #7276

configure.ac: make non-executable

it needs to be processed by autoconf or autoreconf, and doesn't have a
suitable shebang to be directly executed. other projects normally set
configu

configure.ac: make non-executable

it needs to be processed by autoconf or autoreconf, and doesn't have a
suitable shebang to be directly executed. other projects normally set
configure.ac -x.

Closes #7272

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configure: disable RTSP when hyper is selected

Makes test 1013 work

Closes #7209

configure: rename get-easy-option configure option to get-easy-options

"get-easy-options" is the configure option advertised by the help text
anyway, so use that.

Fixes #7211

configure: rename get-easy-option configure option to get-easy-options

"get-easy-options" is the configure option advertised by the help text
anyway, so use that.

Fixes #7211
Closes #7213

Follow-up to ad691b191 ("configure: added --disable-get-easy-options")
Suggested-by: Daniel Stenberg <daniel@haxx.se>
Signed-off-by: Bastian Krause <bst@pengutronix.de>

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metalink: remove

Warning: this will make existing curl command lines that use metalink to
stop working.

Reasons for removal:

1. We've found several security problems an

metalink: remove

Warning: this will make existing curl command lines that use metalink to
stop working.

Reasons for removal:

1. We've found several security problems and issues involving the
metalink support in curl. The issues are not detailed here. When
working on those, it become apparent to the team that several of the
problems are due to the system design, metalink library API and what
the metalink RFC says. They are very hard to fix on the curl side
only.

2. The metalink usage with curl was only very briefly documented and was
not following the "normal" curl usage pattern in several ways, making
it surprising and non-intuitive which could lead to further security
issues.

3. The metalink library was last updated 6 years ago and wasn't so
active the years before that either. An unmaintained library means
there's a security problem waiting to happen. This is probably reason
enough.

4. Metalink requires an XML parsing library, which is complex code (even
the smaller alternatives) and to this day often gets security
updates.

5. Metalink is not a widely used curl feature. In the 2020 curl user
survey, only 1.4% of the responders said that they'd are using it. In
2021 that number was 1.2%. Searching the web also show very few
traces of it being used, even with other tools.

6. The torrent format and associated technology clearly won for
downloading large files from multiple sources in parallel.

Cloes #7176

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docs/INSTALL: remove mentions of configure --with-darwin-ssl

... as it isn't supported since a while back.

Make configure fail with a warning if used.

Reported-by: Vadim Gr

docs/INSTALL: remove mentions of configure --with-darwin-ssl

... as it isn't supported since a while back.

Make configure fail with a warning if used.

Reported-by: Vadim Grinshpun
Bug: https://curl.se/mail/lib-2021-06/0008.html
Closes #7200

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configure: add --disable-ntlm option

Closes #7028

lib/hostip6.c: make NAT64 address synthesis on macOS work

Closes #7121

quiche: update for network path aware API

Latest version of quiche requires the application to pass the peer
address of received packets, and it provides the address for outgoing
pac

quiche: update for network path aware API

Latest version of quiche requires the application to pass the peer
address of received packets, and it provides the address for outgoing
packets back.

Closes #7120

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configure: if asked for, fail if ldap is not found

Reported-by: Jakub Zakrzewski
Fixes #7053
Closes #7055

configure: fix typo in TLS error message

Reported-by: Pontus Lundkvist

configure: split out each TLS library detector into its own function

... and put those functions in separate m4 files per TLS library.

configure: make the TLS library choice(s) explicit

configure no longer tries to find a TLS library by default, but all
libraries are now equal: the user needs to explicitly ask what TLS

configure: make the TLS library choice(s) explicit

configure no longer tries to find a TLS library by default, but all
libraries are now equal: the user needs to explicitly ask what TLS
library or libraries to use.

If no TLS library is selected, configure will error out unless
--without-ssl is explicitly used to request a built without TLS (as that
is very rare these days).

Removes: --with-winssl, --with-darwinssl and all --without-* options for
TLS libraries.

Closes #6897

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hsts: enable by default

No longer considered experimental.

Closes #6700

configure: provide --with-openssl, deprecate --with-ssl

Makes the option more explicit.

Closes #6887

configure: fix CURL_DARWIN_CFLAGS use

The macro name change was not completely done.

Follow-up to 5d2c384452543c
Bug: https://github.com/curl/curl/commit/5d2c384452543c7b6c9fb02

configure: fix CURL_DARWIN_CFLAGS use

The macro name change was not completely done.

Follow-up to 5d2c384452543c
Bug: https://github.com/curl/curl/commit/5d2c384452543c7b6c9fb02eaa0afc84fd5ab941#commitcomment-49315187
Reported-by: Marcel Raad
Closes #6878

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configure: include <time.h> unconditionally

In 2682e5f5, several instances of AC_HEADER_TIME were removed since
it is a deprecated autoconf macro. However, this was the macro that
de

configure: include <time.h> unconditionally

In 2682e5f5, several instances of AC_HEADER_TIME were removed since
it is a deprecated autoconf macro. However, this was the macro that
defined TIME_WITH_SYS_TIME, which was used to indicate that <time.h>
can be included alongside <sys/time.h>. TIME_WITH_SYS_TIME is still
used in the configure test body and since it is no longer defined,
<time.h> is *not* included on systems that have <sys/time.h>.

In particular, at least on musl libc and glibc, <sys/time.h> does
not implicitly include <time.h> and does not declare clock_gettime,
gmtime_r, or localtime_r. This causes configure to fail to detect
those functions.

The AC_HEADER_TIME macro deprecation text says

> All current systems provide time.h; it need not be checked for.
> Not all systems provide sys/time.h, but those that do, all allow
> you to include it and time.h simultaneously.

So, to fix this issue, simply include <time.h> unconditionally when
testing for time-related functions and in libcurl, and don't bother
checking for it.

Closes #6859

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