setlocale: Handle LC_MESSAGES correctly on native Windows

[Bruno Haible]

On native Windows, LC_MESSAGES does not exist in <locale.h>; Gnulib adds
a definition of it. Accordingly, setlocale() needs to be taught to handle
the LC_MESSAGES category as part of LC_ALL. The code for doing this was
incomplete.

The first of these patches fixes it. The second patch adds a unit test.


2024-12-23  Bruno Haible  <bruno@clisp.org>

        setlocale tests: Add unit test for LC_MESSAGES handling.
        * tests/test-setlocale-w32.c: New file.
        * modules/setlocale-tests (Files): Add it.
        (Makefile.am): Arrange to compile and run test-setlocale-w32.

        setlocale: Handle LC_MESSAGES correctly on native Windows.
        * lib/setlocale.c (setlocale_improved): Revamp the LC_ALL case if
        LC_MESSAGES is 1729.

0001-setlocale-Handle-LC_MESSAGES-correctly-on-native-Win.patch
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0002-setlocale-tests-Add-unit-test-for-LC_MESSAGES-handli.patch
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