vtls: remove Curl_ prefix from static functions

bearssl: remove Curl_ prefix from static functions

mbedtls: remove Curl_ prefix from static functions

wolfssl: remove Curl_ prefix from static functions

nss: remove Curl_ prefix from static functions

gnutls: remove Curl_ prefix from static functions

openssl: remove Curl_ prefix from static functions

... as we reserve this prefix to library-wide functions.

Closes #6443

nss: get the run-time version instead of build-time

Closes #6445

tool_doswin: Restore original console settings on CTRL signal

- Move Windows terminal init code from tool_main to tool_doswin.

- Restore the original console settings on CTRL+C and

tool_doswin: Restore original console settings on CTRL signal

- Move Windows terminal init code from tool_main to tool_doswin.

- Restore the original console settings on CTRL+C and CTRL+BREAK.

Background: On Windows the curl tool changes the console settings to
enable virtual terminal processing (eg color output) if supported
(ie Win 10). The original settings are restored on exit but prior to
this change were not restored in the case of the CTRL signals.

Windows VT behavior varies depending on console/powershell/terminal;
refer to the discussion in #6226.

Assisted-by: Rich Turner

Closes https://github.com/curl/curl/pull/6226

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gen.pl: fix perl syntax

Follow-up to 324cf1d2e

help: update to current codebase

This commit bumps the help to the current state of the project.

Closes #6437

docs: fix line length bug in gen.pl

The script warns if the length of $opt and $desc is > 78. However, these
two variables are on totally separate lines so the check makes no sense.

docs: fix line length bug in gen.pl

The script warns if the length of $opt and $desc is > 78. However, these
two variables are on totally separate lines so the check makes no sense.
Also the $bitmask field is totally forgotten. Currently this leads to
two warnings within `--resolve` and `--aws-sigv4`.

Closes #6438

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docs: fix wrong documentation in help.d

curl does not list all categories when you invoke "--help" without any
parameters.

Closes #6436

aws-sigv4.d: polish the wording

Make it shorter and imperative form

Closes #6439

misc: fix typos

Bug: https://curl.se/mail/lib-2021-01/0063.html
Closes #6434

multi_runsingle: bail out early on data->conn == NULL

As that's a significant error condition and scan-build warns for NULL
pointer dereferences if we don't.

Closes #6433

multi: skip DONE state if there's no connection left for ftp wildcard

... to avoid running in that state with data->conn being NULL.

libssh2: fix "Value stored to 'readdir_len' is never read"

Detected by scan-build

connect: mark intentional ignores of setsockopt return values

Pointed out by Coverity

Closes #6431

http_proxy: Fix CONNECT chunked encoding race condition

- During the end-of-headers response phase do not mark the tunnel
complete unless the response body was completely parsed/ignore

http_proxy: Fix CONNECT chunked encoding race condition

- During the end-of-headers response phase do not mark the tunnel
complete unless the response body was completely parsed/ignored.

Prior to this change if the entirety of a CONNECT response with chunked
encoding was not received by the time the final header was parsed then
the connection would be marked done prematurely, before all the chunked
data could be read in and ignored (since this is what we do with any
CONNECT response body) and the connection could not be used.

Bug: https://curl.se/mail/lib-2021-01/0033.html
Reported-by: Fabian Keil

Closes https://github.com/curl/curl/pull/6432

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RELEASE-NOTES: synced

url: if IDNA conversion fails, fallback to Transitional

This improves IDNA2003 compatiblity.

Reported-by: Bubu on github
Fixes #6423
Closes #6428

travis: make the Hyper build from its master branch

Closes #6430

http: make 'authneg' also work for Hyper

When doing a request with a request body expecting a 401/407 back, that
initial request is sent with a zero content-length. Test 177 and more.

http: make 'authneg' also work for Hyper

When doing a request with a request body expecting a 401/407 back, that
initial request is sent with a zero content-length. Test 177 and more.

Closes #6424

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cmake: Add an option to disable libidn2

New option USE_LIBIDN2 defaults to ON for libidn2 detection. Prior to
this change libidn2 detection could not be turned off in cmake builds.

cmake: Add an option to disable libidn2

New option USE_LIBIDN2 defaults to ON for libidn2 detection. Prior to
this change libidn2 detection could not be turned off in cmake builds.

Reported-by: William A Rowe Jr

Fixes https://github.com/curl/curl/issues/6361
Closes https://github.com/curl/curl/pull/6362

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