There's no point redefining these functions if they are supported by the compiler and the version of libstdc++. Also, some of the builtins used by the absl implementation of these functions (e.g. __has_trivial_destructor) have been deprecated in Clang 15.

PiperOrigin-RevId: 465554125
Change-Id: I8674c3a5270ce3c654cdf58ae7dbd9d2bda8faa5