[CPP] Update GCC minversion check to 9 or newer (#120126)
It's already a requirement for building PyTorch, but should be a
requirement for linking extensions with it, as that can lead to runtime
crashes, as `std::optional` template layout is incompatible between
gcc-9 and older compilers.
Also, update minimum supported clang version to 9.x(used to build Android), as clang-5 is clearly not C++17 compliant.
Fixes https://github.com/pytorch/pytorch/issues/120020
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120126
Approved by: https://github.com/Skylion007
