Makefile.am (gfor_helper_src): Add runtime/normalize.f90.

Makefile.am (gfor_helper_src): Add runtime/normalize.f90.

	* Makefile.am (gfor_helper_src): Add runtime/normalize.f90.
	* configure.ac: Add checks for nextafter and nextafterf.
	* Makefile.in, config.h.in, configure: Regenerate.
	* libgfortran.h (normalize_r4_i4, normalize_r8_i8): Declare.
	* intrinsics/rand.c (rand): Use normalize_r4_i4.
	* intrinsics/random.c (random_r4): Use normalize_r4_i4.
	(random_r8): Use normalize_r8_i8.
	* runtime/normalize.c: New file.
testsuite/
	* gfortran.fortran-torture/execute/random_2.f90: New test.

From-SVN: r83070