[libc][complex] check that cfloat128 is not defined as _Complex long double#119324

Sh0g0-1758 merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

Sh0g0-1758:libc_fix_conjugateSh0g0-1758/llvm-project:libc_fix_conjugateCopy head branch name to clipboard