compilers: cpp: wire up stdlib assertions

None of the options set here affect ABI and are intended for detecting constraint
violations.

For GCC, we simply need to set -D_GLIBCXX_ASSERTIONS.

For Clang, the situation is far more complicated:
* LLVM 18 uses a 'hardened mode' (https://libcxx.llvm.org/Hardening.html).
  There are several levels of severity available here. I've chosen
  _LIBCPP_HARDENING_MODE_EXTENSIVE as the strongest-but-one. The strongest
  one (_DEBUG) doesn't affect ABI still but is reserved for stldebug.

* LLVM 15 uses a similar approach to libstdc++ called '_LIBCPP_ENABLE_ASSERTIONS'

Note that LLVM 17 while in development had fully deprecated _LIBCPP_ENABLE_ASSERTIONS
in favour of hardened, but changed its mind last-minute: https://discourse.llvm.org/t/rfc-hardening-in-libc/73925/4.

Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>

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