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build: fix -Wstrict-prototypes (Clang 16)

Sam James requested to merge (removed):clang-16 into main

Clang 16 warns on -Wstrict-prototypes in preparation for C23 which can among other things, lead to some configure tests silently failing/returning the wrong result.

Fixes this error:

-ignoreme: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
+ignoreme: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
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For more information, see LWN.net [0] or LLVM's Discourse [1], gentoo-dev@ [2], or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/ [1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213 [2] https://archives.gentoo.org/gentoo-dev/message/dd9f2d3082b8b6f8dfbccb0639e6e240 [3] hosted at lists.linux.dev.

Bug: https://bugs.gentoo.org/879747 Signed-off-by: Sam James sam@gentoo.org

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