conformtest: Correct some stdio.h expectations for UNIX98.

conformtest: Correct some stdio.h expectations for UNIX98.

The conform/ test of stdio.h for UNIX98 fails with surious namespace
errors for functions that are correctly declared for that standard.
This patch fixes the expectations to expect those functions also for
UNIX98.  (This does not by itself fix the XFAIL of that test, and is
not based a full review of the header expectations so there could
still be other bugs in the expectations for this header for UNIX98.)

Tested for x86_64 and x86.

	* conform/data/stdio.h-data (flockfile): Also expect for [UNIX98].
	(fseeko): Likewise.
	(ftello): Likewise.
	(ftrylockfile): Likewise.
	(funlockfile): Likewise.
	(getc_unlocked): Likewise.
	(getchar_unlocked): Likewise.
	(putc_unlocked): Likewise.
	(putchar_unlocked): Likewise.