url: always clone the CUROPT_CURLU handle

Since a few code paths actually update that data.

Fixes #3753
Closes #3761

Reported-by: Poul T Lomholt

CURLOPT_DNS_USE_GLOBAL_CACHE: remove

Remove the code too. The functionality has been disabled in code since
7.62.0. Setting this option will from now on simply be ignored and have
no

CURLOPT_DNS_USE_GLOBAL_CACHE: remove

Remove the code too. The functionality has been disabled in code since
7.62.0. Setting this option will from now on simply be ignored and have
no function.

Closes #3654

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travis: install libgnutls28-dev only for --with-gnutls build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install libnss3-dev only for --with-nss build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install libssh2-dev only for --with-libssh2 build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install libssh-dev only for --with-libssh build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install krb5-user only for --with-gssapi build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install lcov only for the coverage job

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

travis: install clang only when needed

This reduces the GCC job runtimes a little and it's needed to
selectively update clang builds to xenial.

Closes https://github.com/curl/cu

travis: install clang only when needed

This reduces the GCC job runtimes a little and it's needed to
selectively update clang builds to xenial.

Closes https://github.com/curl/curl/pull/3721

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AppVeyor: enable testing for WinSSL build

Closes https://github.com/curl/curl/pull/3725

build: fix Codacy/CppCheck warnings

- remove unused variables
- declare conditionally used variables conditionally
- suppress unused variable warnings in the CMake tests
- remove

build: fix Codacy/CppCheck warnings

- remove unused variables
- declare conditionally used variables conditionally
- suppress unused variable warnings in the CMake tests
- remove dead variable stores
- consistently use WIN32 macro to detect Windows

Closes https://github.com/curl/curl/pull/3739

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polarssl_threadlock: remove conditionally unused code

Make functions no-ops if neither both USE_THREADS_POSIX and
HAVE_PTHREAD_H nor both USE_THREADS_WIN32 and HAVE_PROCESS_H are
def

polarssl_threadlock: remove conditionally unused code

Make functions no-ops if neither both USE_THREADS_POSIX and
HAVE_PTHREAD_H nor both USE_THREADS_WIN32 and HAVE_PROCESS_H are
defined. Previously, if only one of them was defined, there was either
code compiled that did nothing useful or the wrong header included for
the functions used.

Also, move POLARSSL_MUTEX_T define to implementation file as it's not
used externally.

Closes https://github.com/curl/curl/pull/3739

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lib557: initialize variables

These variables are only conditionally initialized.

Closes https://github.com/curl/curl/pull/3739

lib509: add missing include for strdup

Closes https://github.com/curl/curl/pull/3739

README.md: fix no-consecutive-blank-lines Codacy warning

Consistently use one blank line between blocks.

Closes https://github.com/curl/curl/pull/3739

tests/server/util: fix Windows Unicode build

Always use the ANSI version of FormatMessage as we don't have the
curl_multibyte gear available here.

Closes https://github.com/curl

tests/server/util: fix Windows Unicode build

Always use the ANSI version of FormatMessage as we don't have the
curl_multibyte gear available here.

Closes https://github.com/curl/curl/pull/3758

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curl_easy_getinfo.3: fix minor formatting mistake

xattr: skip unittest on unsupported platforms

The stripcredentials unittest fails to compile on platforms without
xattr support, for example the Solaris member in the buildfarm which

xattr: skip unittest on unsupported platforms

The stripcredentials unittest fails to compile on platforms without
xattr support, for example the Solaris member in the buildfarm which
fails with the following:

CC unit1621-unit1621.o
CC ../libtest/unit1621-first.o
CCLD unit1621
Undefined first referenced
symbol in file
stripcredentials unit1621-unit1621.o
goto problem 2
ld: fatal: symbol referencing errors. No output written to .libs/unit1621
collect2: error: ld returned 1 exit status
gmake[2]: *** [Makefile:996: unit1621] Error 1

Fix by excluding the test on such platforms by using the reverse
logic from where stripcredentials() is defined.

Closes #3759
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

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emailL Added reference to RFC8314 for implicit TLS

README: Schannel, stop calling it "winssl"

Stick to "Schannel" everywhere - follow up to 180501cb.

cmake: clear CMAKE_REQUIRED_LIBRARIES after each use

This fixes GSSAPI builds with the libraries in a non-standard location.
The testing for recv() were failing because it failed to link

cmake: clear CMAKE_REQUIRED_LIBRARIES after each use

This fixes GSSAPI builds with the libraries in a non-standard location.
The testing for recv() were failing because it failed to link
the Kerberos libraries, which are not needed for this or subsequent
tests.

fixes #3743
closes #3744

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cmake: avoid linking executable for some tests with cmake 3.6+

With CMAKE_TRY_COMPILE_TARGET_TYPE set to STATIC_LIBRARY, the try_compile()
(which is used by check_c_source_compiles()) wi

cmake: avoid linking executable for some tests with cmake 3.6+

With CMAKE_TRY_COMPILE_TARGET_TYPE set to STATIC_LIBRARY, the try_compile()
(which is used by check_c_source_compiles()) will build static library
instead of executable. This avoids linking additional libraries in and thus
speeds up those checks a little.

This commit also avoids #3743 (GSSAPI build errors) on itself with cmake
3.6 or above. That issue was fixed separately for all versions.

Ref: #3744

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cmake: minor cleanup

- Remove nneeded include_regular_expression.
It was setting what is already a default.

- Remove duplicated include.

- Don't check for pre-3.0.0 C

cmake: minor cleanup

- Remove nneeded include_regular_expression.
It was setting what is already a default.

- Remove duplicated include.

- Don't check for pre-3.0.0 CMake version.
We already require at least 3.0.0, so it's just clutter.

Ref: #3744

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build-openssl.bat: Fixed support for OpenSSL v1.1.0+

build-openssl.bat: Perfer the use of if statements rather than goto (where possible)