std.os.linux: Replace `@hasDecl()` with `!= void` check for VDSO.
If there is a VDSO, it will have clock_gettime(). The main thing we're concerned
about is architectures that don't have a VDSO at all, of which there are a few.
d71076c982Alex Rønne Petersen committed on 8/3/2024, 4:46:04 PMparent624fa85