crossdev: Use libunwind and libc++ in LLVM environmentsHEADmaster

Avoid build issues on cross environments using musl and LLVM by using
libunwind and libc++ explicitly in the clang configuration. Otherwise,
clang expects GCC libunwind and libstdc++.

These flags were not set explicitly in the clang configuration, because
LLVM profiles were setting them, but that's not the case anymore[0].

[0] https://github.com/gentoo/gentoo/commit/5e5c9d5c524871f5af260557dbd2962b8eec5087

Bug: https://bugs.gentoo.org/941140
Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
Closes: https://github.com/gentoo/crossdev/pull/23
Signed-off-by: Sam James <sam@gentoo.org>

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