PR libfortran/23138
	* acinclude.m4 (LIBGFOR_CHECK_MINGW_SNPRINTF): New check.
	* configure.ac: Use LIBGFOR_CHECK_MINGW_SNPRINTF.
	* libgfortran.h: If HAVE_MINGW_SNPRINTF is true, use __mingw_snprintf
	instead of snprintf.
	* config.h.in: Regenerate.
	* configure: Regenerate.

From-SVN: r127739