Merge branch 'ps/clang-w-glibc-2.43-and-_Generic' into maint-2.54

Headers from glibc 2.43 when used with clang does not allow disabling C11 language features, causing build failures.. * ps/clang-w-glibc-2.43-and-_Generic: build: tolerate use of _Generic from glibc 2.43 with Clang