[libc++abi] Fix test failures with GCC 14 (#95759)

This adds a new `__cxa_call_terminate`, which GCC 14 generates calls to
now. Clang had `__clang_call_terminate` for the same use-case for a long

[libc++abi] Fix test failures with GCC 14 (#95759)

This adds a new `__cxa_call_terminate`, which GCC 14 generates calls to
now. Clang had `__clang_call_terminate` for the same use-case for a long
time. It also fixes a test that is enabled now, since GCC has the
`__has_feature` FTM now.

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