new module 'bcp47'

[Bruno Haible]

BCP 47 is an IETF specification for locale names. Since
<https://en.wikipedia.org/wiki/IETF_language_tag> says that this specification
is "used by computing standards such as HTTP, HTML, XML and PNG", it makes
sense for Gnulib to support it.

Here comes a module 'bcp47' that provides support for it, in the form of
conversion function from/to the XPG syntax (generally used by glibc).


2024-10-03  Bruno Haible  <bruno@clisp.org>

        bcp47: Add tests.
        * tests/test-bcp47.c: New file.
        * modules/bcp47-tests: New file.

        bcp47: New module.
        * lib/bcp47.h: New file.
        * lib/bcp47.c: New file.
        * modules/bcp47: New file.

0001-bcp47-New-module.patch
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0002-bcp47-Add-tests.patch
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