build: detect and use `_setmode()` with Cygwin/MSYS, also use on Windows

Before this patch `setmode()` was not detected with Cygwin/MSYS, because
it's a macro, not a function, and detect

build: detect and use `_setmode()` with Cygwin/MSYS, also use on Windows

Before this patch `setmode()` was not detected with Cygwin/MSYS, because
it's a macro, not a function, and detection is looking for a function.

Switching to symbol detection doesn't work because it mis-detects it on
BSD systems which features a function with the same name but different
functionality and arguments.

Fix it by looking for a `_setmode()` function on Cygwin/MSYS, and use it
if available.

`_setmode()` is recommended over `setmode()` by Windows documentation so
use that on Windows too. It seems to be available on all supported
compilers, so omit detection.

https://learn.microsoft.com/cpp/c-runtime-library/reference/posix-setmode
https://learn.microsoft.com/cpp/c-runtime-library/reference/setmode

Officially Windows requires argument `_O_BINARY` with an underscore.
`O_BINARY` is also supported but bound to conditions. Continue to use it
for simplicity. Cygwin supports `O_BINARY` (no underscore).

Closes #15169

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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copyright: fix year ranges

Follow-up from 4d2f8006777

curl.se: new home

Closes #6172

copyrights: fix copyright year range

.. because checksrc's copyright year check stopped working.

Ref: https://github.com/curl/curl/pull/4547

Closes https://github.com/curl/

copyrights: fix copyright year range

.. because checksrc's copyright year check stopped working.

Ref: https://github.com/curl/curl/pull/4547

Closes https://github.com/curl/curl/pull/4549

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whitespace fixes

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few inde

whitespace fixes

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
in manual examples

Closes https://github.com/curl/curl/pull/3037

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URLs: change all http:// URLs to https://

copyright: Updated the copyright year following recent updates

tool_binmode.c: Explicitly ignore the return code of setmode

Fixes code analysis warning C6031:
return value ignored: <function> could return unexpected value

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use of 76 lib/*.h renamed files
ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

13606bb... build: make use of 93 lib/*.c renamed files
5b6e792... build: rename 93 lib/*.c files
7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

lib/curl_imap.h
lib/curl_smtp.h

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build: make use of 76 lib/*.h renamed files

76 private header files renamed to use our standard naming scheme.

This change affects 322 files in libcurl's source tree.

curl tool: use configuration files from lib directory

Configuration files such as curl_config.h and all config-*.h no longer exist
nor are generated/copied into 'src' directory, now thes

curl tool: use configuration files from lib directory

Configuration files such as curl_config.h and all config-*.h no longer exist
nor are generated/copied into 'src' directory, now these only exist in 'lib'
directory from where curl tool sources uses them.

Additionally old src/setup.h has been refactored into src/tool_setup.h which
now pulls lib/setup.h

The possibility of a makefile needing an include path adjustment exists.

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curl tool: fix compiler warning

curl tool: symbol check adjustment

curl tool: reviewed code moved to tool_*.[ch] files