-fdump-go-spec: ignore type ordering of incomplete types

-fdump-go-spec: ignore type ordering of incomplete types

gcc/:
	* godump.c (go_format_type): Don't consider whether a type has
	been seen when determining whether to output a type by name.
	Consider only the use_type_name parameter.
	(go_output_typedef): When outputting a typedef, format the
	declaration's original type, which contains the name of the
	underlying type rather than the name of the typedef.
gcc/testsuite:
	* gcc.misc-tests/godump-1.c: Add test case.