re PR libfortran/16135 (libfortran doesn't build, use of C99 types)

re PR libfortran/16135 (libfortran doesn't build, use of C99 types)

	PR target/16135
	* acinclude.m4 (LIBGFOR_TARGET_ILP32): New check.
	* configure.ac: Include LIBGFOR_TARGET_ILP32.
	* configure: Regenerate.
	* config.h.in: Likewise.
	* libgfortran.h: Provide default definitions for C99 types
	on ILP32 targets that don't have them.

	PR target/17999
	* configure.ac: Check for snprintf.
	* configure: Regenerate.
	* config.h.in: Likewise.
	* intrinsics/date_and_time.c (date_and_time): Do not
	use snprinf if it is not available.
	* io/write.c (output_float): Likewise.

From-SVN: r90964