Function bootstrap::dist::verify_uefi_rlib_format

fn verify_uefi_rlib_format(
    builder: &Builder<'_>,
    target: TargetSelection,
    stamp: &Path
)

Check that all objects in rlibs for UEFI targets are COFF. This ensures that the C compiler isn’t producing ELF objects, which would not link correctly with the COFF objects.