media-libs/id3lib: fix C23 issues as best we can

The situation here is complicated. With C23, 'bool' is exposed properly
out of the box (as the same type as '_Bool'). But this is problematic
when it comes to C++ where 'bool' was always '_Bool' (or near-enough
guaranteed), and where we have existing C applications that we don't
want to break ABI for.

For C++, id3tag was always using native C++ 'bool', so we don't want to change
that now when looking at C23 compat. This means the ABI issues between
C and C++ remain: typedef bool my_bool.

For C, continue using the old 'int bool' that the project did before
C23. This doesn't solve the pre-existing C/C++ ABI issue here where
C++ always had "good _Bool-as-bool", unfortunately: typedef int my_bool.

Really, we need people to port to taglib ASAP.

Bug: https://bugs.gentoo.org/893644
Bug: https://bugs.gentoo.org/949086
Signed-off-by: Sam James <sam@gentoo.org>

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