Fix the definitions around printf: either we use system printf in which

Fix the definitions around printf: either we use system printf in which

	* configure.in: Fix the definitions around printf: either we use
	system printf in which case HAVE_VASPRINTF, HAVE_C99_VSNPRINTF and
	HAVE_UNIX98_PRINTF have already been determined by earlier tests,
	or we use the included printf, in which case we know that these
	three can be defined as 1.  (#99826)