sys-devel/gcc: backport two fixes to 15.0.1_pre20250323

See https://bugs.gentoo.org/952059#c4, quoting that:
> The story here is that GCC 15 will support [[clang::musttail]], but it
> turns out that [[clang::musttail]] in Clang (and as it's a Clang-namespaced
> extension, they get to decide the semantics) takes a "UB on invalid input"
> approach rather than diagnosing.
>
> The plan is to make [[clang::musttail]] relaxed (matching Clang) and to
> have [[gnu::musttail]] with diagnostics.
>
> This shows up now in qtwebengine because __has_attribute sees musttail is
> available, so it automagically uses it (which is fine), just a GCC bug
> then gets in the way.
>
> I'm probably going to backport a patch to just temporarily disable musttail
> again until next week, as various fixes are landing.

I've also backported a fix to fix an e2fsprogs/sqlite miscompilation
on x86.

Closes: https://bugs.gentoo.org/951997
Closes: https://bugs.gentoo.org/951999
Closes: https://bugs.gentoo.org/952059
Closes: https://bugs.gentoo.org/952085
Signed-off-by: Sam James <sam@gentoo.org>

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