xgetdomainname: Improve GCC 11 allocation-deallocation checking

[Bruno Haible]

Adding _GL_ATTRIBUTE_* declarations to xgetdomainname.h leads to a compilation
error. The cause is that xgetdomainname.c does not include <config.h>. But
adding '#include <config.h>' would then cause <config.h> to be included twice
in the same compilation unit, which may have bad effects.

So, this situation needs to cleaned up first.


2021-08-07  Bruno Haible  <bruno@clisp.org>

        xgetdomainname: Improve GCC 11 allocation-deallocation checking.
        * lib/xgetdomainname.h: Include <stdlib.h>.
        (xgetdomainname): Declare that deallocation must happen through 'free'.

2021-08-07  Bruno Haible  <bruno@clisp.org>

        xgetdomainname: Ensure .c file starts with '#include <config.h>'.
        * lib/xgetaname-impl.h: New file, based on lib/xgethostname.c.
        * lib/xgethostname.c: Move implementation to lib/xgetaname-impl.h.
        * lib/xgetdomainname.c: Include <config.h>. Include xgetaname-impl.h
        instead of xgethostname.c.
        * modules/xgethostname (Files): Add lib/xgetaname-impl.h.
        * modules/xgetdomainname (Files): Likewise.
        (Depends-on): Remove xgethostname. Add free-posix, xalloc.

0001-xgetdomainname-Ensure-.c-file-starts-with-include-co.patch
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0002-xgetdomainname-Improve-GCC-11-allocation-deallocatio.patch
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