re PR libfortran/31335 (Calls lstat(), stat() and fstat() in libgfortran should be protected by autoconf HAVE_{L,,F}STAT macros)

	PR libfortran/31335
	* intrinsics/stat.c: Only provide STAT and FSTAT library routines
	if stat() and fstat() library functions are available. When lstat()
	is not available, use stat() instead.
	* configure.ac: Add checks for stat, fstat and lstat.
	* configure: Regenerate.
	* config.h.in: Regenerate.

From-SVN: r123388