runtests: move the gnutls-serv tests to a dynamic port

Affects test 320, 321, 322 and 324.

Closes #5778

runtests: support dynamicly base64 encoded sections in tests

This allows us to make test cases to use base64 at run-time and still
use and verify information determined at run-time, such

runtests: support dynamicly base64 encoded sections in tests

This allows us to make test cases to use base64 at run-time and still
use and verify information determined at run-time, such as the IMAP test
server's port number in test 842.

This change makes 12 tests run again that basically never ran since we
moved to dynamic port numbers.

ftpserver.pl is adjusted to load test instructions and test number from
the preprocessed test file.

FILEFORMAT.md now documents the new base64 encoding syntax.

Reported-by: Marcel Raad
Fixes #5761
Closes #5775

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curl.1: add a few missing valid exit codes

93 - 96 can be returned as well.

Closes #5777

TODO: Use multiple parallel transfers for a single download

Closes #5774

TODO: Set the modification date on an uploaded file

Closes #5768

CI: Add muse CI config

Closes #5772

travis/script.sh: fix use of `-n' with unquoted envvar

Shellcheck tells us "-n doesn't work with unquoted arguments. quote or
use [[ ]]."

And testing shows:

```
doc

travis/script.sh: fix use of `-n' with unquoted envvar

Shellcheck tells us "-n doesn't work with unquoted arguments. quote or
use [[ ]]."

And testing shows:

```
docker run --rm -it ubuntu bash
root@fe85ce156856:/# [ -n $DOES_NOT_EXIST ] && echo "I ran"
I ran
root@fe85ce156856:/# [ -n "$DOES_NOT_EXIST" ] && echo "I ran"
root@fe85ce156856:/#
```

Closes #5773

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h2: repair trailer handling

The previous h2 trailer fix in 54a2b63 was wrong and caused a
regression: it cannot deal with trailers immediately when read since
they may be read off th

h2: repair trailer handling

The previous h2 trailer fix in 54a2b63 was wrong and caused a
regression: it cannot deal with trailers immediately when read since
they may be read off the connection by the wrong 'data' owner.

This change reverts the logic back to gathering all trailers into a
single buffer, like before 54a2b63.

Reported-by: Tadej Vengust
Fixes #5663
Closes #5769

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windows: disable Unix Sockets for old mingw

Classic mingw and 10y+ old versions of mingw-w64 don't ship with
Windows headers having the typedef necessary for Unix Sockets
support, so

windows: disable Unix Sockets for old mingw

Classic mingw and 10y+ old versions of mingw-w64 don't ship with
Windows headers having the typedef necessary for Unix Sockets
support, so try detecting these environments to disable this
feature.

Ref: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/cf6afc57179a5910621215f8f4037d406892072c/

Reviewed-by: Daniel Stenberg

Fixes #5674
Closes #5758

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test1908: treat file as text

Fixes the line endings on Windows.

Closes https://github.com/curl/curl/pull/5767

TrackMemory tests: ignore realloc and free in getenv.c

These are only called for WIN32.

Closes https://github.com/curl/curl/pull/5767

tests/FILEFORMAT.md: mention %HTTP2PORT

RELEASE-NOTES: synced

tlsv1.3.d. only for TLS-using connections

... and rephrase that "not all" TLS backends support it.

Closes #5764

tls-max.d: this option is only for TLS-using connections

Ref: #5763
Closes #5764

tool_doswin: Simplify Windows version detection

Closes https://github.com/curl/curl/pull/5754

win32: Add Curl_verify_windows_version() to curlx

Closes https://github.com/curl/curl/pull/5754

runtests.pl: treat LibreSSL and BoringSSL as OpenSSL

This makes the tests that require the OpenSSL feature also run for
those two compatible libraries.

Closes https://github.com

runtests.pl: treat LibreSSL and BoringSSL as OpenSSL

This makes the tests that require the OpenSSL feature also run for
those two compatible libraries.

Closes https://github.com/curl/curl/pull/5762

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multi: Condition 'extrawait' is always true

Reported by Codacy.

Reviewed-by: Marcel Raad
Closes #5759

openssl: fix build with LibreSSL < 2.9.1

`SSL_CTX_add0_chain_cert` and `SSL_CTX_clear_chain_certs` were
introduced in LibreSSL 2.9.1 [0].

[0] https://github.com/libressl-portabl

openssl: fix build with LibreSSL < 2.9.1

`SSL_CTX_add0_chain_cert` and `SSL_CTX_clear_chain_certs` were
introduced in LibreSSL 2.9.1 [0].

[0] https://github.com/libressl-portable/openbsd/commit/0db809ee178457c8170abfae3931d7bd13abf3ef

Closes https://github.com/curl/curl/pull/5757

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multi_remove_handle: close unused connect-only connections

Previously any connect-only connections in a multi handle would be kept
alive until the multi handle was closed. Since these c

multi_remove_handle: close unused connect-only connections

Previously any connect-only connections in a multi handle would be kept
alive until the multi handle was closed. Since these connections cannot
be re-used, they can be marked for closure when the associated easy
handle is removed from the multi handle.

Closes #5749

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checksrc: invoke script with -D to find .checksrc proper

Without the -D command line option, checksrc.pl won't know which
directory to load the ".checksrc" file from when building out of

checksrc: invoke script with -D to find .checksrc proper

Without the -D command line option, checksrc.pl won't know which
directory to load the ".checksrc" file from when building out of the
source tree.

Reported-by: Marcel Raad
Fixes #5715
Closes #5755

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buildconf: retire ares buildconf invocation

no longer needed after 4259d2df7dd95637a4b1e3fb174fe5e5aef81069

buildconf: excempt defunct reference to ACLOCAL_FLAGS

retired with 09f278121e815028adb24d228d8092fc6cb022aa but kept around as
the name is generic enough that it might be in use and reli

buildconf: excempt defunct reference to ACLOCAL_FLAGS

retired with 09f278121e815028adb24d228d8092fc6cb022aa but kept around as
the name is generic enough that it might be in use and relied upon from
the environment.

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buildconf: avoid array concatenation in die()

reported as error SC2145[1] by shellcheck, but not expected to cause
any behavioural differences otherwise.

[1] https://github.com/

buildconf: avoid array concatenation in die()

reported as error SC2145[1] by shellcheck, but not expected to cause
any behavioural differences otherwise.

[1] https://github.com/koalaman/shellcheck/wiki/SC2145

Closes #5701

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