4b0bac0dce
A signature is a built-in if and only if builtin_info != NULL, so we don't actually need a separate flag bit. Making a boolean-valued method allows existing code to ask the same question while not worrying about the internal representation. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Paul Berry <stereotype441@gmail.com>