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Use the standard countof instead of our mutt_array_size() (#4628)

countof() is the name blessed by the C Committee for ISO C2y.
Use it if available, and define it if not.

countof() will be provided by GCC 16 and Clang 21.

This is mostly a scripted change:

	$ find . -type f \
	| grep '\.[ch]$' \
	| xargs grep -l mutt_array_size \
	| xargs sed -i 's/mutt_array_size(/countof(/';

Apart from the scripted changes, I've changed the definition at
"mutt/memory.h".

Link: <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3550.pdf#subsubsection.0.6.5.4.5>
Link: <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3550.pdf#section.0.7.21>
Link: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117025>
Link: <https://github.com/llvm/llvm-project/issues/102836>
Reviewed-by: Pietro Cerutti <gahr@gahr.ch>

Signed-off-by: Alejandro Colomar <alx@kernel.org>

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