[builds] Fix -Wstrict-prototypes
- builds/unix/configure.raw: fix -Wstrict-prototypes. Clang 16 warns on these and they'll be dropped in C23.
- builds/unix/freetype2.m4: ditto.
Signed-off-by: Sam James sam@gentoo.org
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Signed-off-by: Sam James sam@gentoo.org