libfortran: Add 5 missing UNSIGNED symbols [PR120153]

libfortran: Add 5 missing UNSIGNED symbols [PR120153]

While looking at PR120152, I have noticed that libgfortran.so doesn't
export 5 *m16* symbols I would have expected that should be exported.
This is caused by 2 issues, one filename was forgotten to be added in r15-4124
to i_maxloc1_c (guess because generated/maxloc1_16_i16.c was kept in the
position after generated/maxloc1_8_m16.c and the i -> m difference wasn't
spotted), and one some garbage prefix on HAVE_GFC_UINTEGER_16 macro.

The first two hunks of this patch fix that.
Though, as GCC 15.1 has been released already, we can't add these symbols
to GFORTRAN_15 symbol version as they've never been there, so the patch
adds them to a new GFORTRAN_15.2 symbol version instead.

2025-05-07  Jakub Jelinek  <jakub@redhat.com>

	PR libfortran/120153
	* Makefile.am (i_maxloc1_c): Add generated/maxloc1_16_m16.c.
	* intrinsics/random.c (arandom_m16): Use #ifdef HAVE_GFC_UINTEGER_16
	guard rather than #ifdef GFC_HAVE_GFC_UINTEGER_16.
	* gfortran.map (GFORTRAN_15): Remove _gfortran_arandom_m16,
	_gfortran_maxloc1_16_m16, _gfortran_mmaxloc1_16_m16 and
	_gfortran_smaxloc1_16_m16.
	(GFORTRAN_15.2): New symbol version, add those 4 symbols to it.
	* generated/maxloc1_16_m16.c: New file.
	* Makefile.in: Regenerate.