more wraplf for aux long long float: s390, sparc and powerpc

more wraplf for aux long long float: s390, sparc and powerpc

The wraplf version of Ada.Numerics.Aux_Long_Long_Float is needed on
s390* as well.  Also add it to sparc*-linux-gnu and powerpc-darwin,
that were missed when adding it for sparc and ppc targets.

for  gcc/ada/ChangeLog

	PR ada/97504
	* Makefile.rtl (LIBGNAT_TARGET_PAIRS): Select wraplf version
	of Aux_Long_Long_Float for s390 and remaining sparc and
	powerpc targets.