Patches to reduce duplication of Gnulib modules.

[Collin Funk]

Hi,

I noticed many files in cpio are older versions of those in Gnulib. Here
are a few patches to just import them.

Patch 1 fixes a function pointer that doesn't work when using 'gcc
-std=c23'. There 'int func ()' == 'int func (void)' so using arguments
throws an error.

Patch 2 makes 'make' return success when running 'make clean' before
'make check'.

Patch 3, 4, 5 removes filemode.c, idcache.c, and userspec.c instead
opting for updated versions in Gnulib.

I'd like to pull in Paul's recent changes to paxutils but that needs a
bit more work. So work-in-progress for now.

Collin

0001-maint-Allow-compilation-with-C23-compilers.patch
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0002-build-Don-t-fail-on-make-clean-before-make-check.patch
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0003-maint-Use-filemode-from-Gnulib.patch
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0003-maint-Use-filemode-from-Gnulib.patch
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0004-maint-Use-idcache-from-Gnulib.patch
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0005-maint-Use-userspec-from-Gnulib.patch
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