LLVM Clang Now Supports -std=c23

LLVM/Clang developers have been working on C23 language support for some time already but to this point it's only been exposed when using the -std=c2x target or -std=gnu2x for the GNU dialect. However, with C2x having been finalized this summer as C23, the LLVM Clang 18 compiler will now honor the -std=c23 option...