dev-qt/qtcore: pass -fno-stack-clash-protection with Clang

With Clang, -fstack-clash-protection seems to lead to qtcore being
miscompiled and e.g. kde-frameworks/syntax-highlighting failing
to compile.

It's hard to justify spending that much time investigating this
for Qt 5 given it's likely it doesn't occur with Qt 6 (significant
changes all over the place) and its build system is far more amenable
to building with various sanitisers.

Given this only happens with Clang, we can likely chalk this up to a Clang
bug, but Qt is huge, and I don't have the time to try minimise this - help
welcome if someone fancies it!

This has probably been latent for quite a long time, but got exposed by
sys-devel/clang-runtime recently starting to pass -fstack-clash-protection
by default to match GCC's behaviour in Gentoo in the new upcoming (WIP) 23.0
profiles.

Thanks in particular to Jonas Rakebrandt <xarblu@protonmail.com> for putting
the work in to find the trigger.

Bug: https://bugs.gentoo.org/865339
KDE-Bug: https://bugs.kde.org/show_bug.cgi?id=462084
KDE-Bug: https://bugs.kde.org/show_bug.cgi?id=464140
Signed-off-by: Sam James <sam@gentoo.org>

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