s12z genelf.em

s12z genelf.em

This changes s12z to use generic.em and genelf.em, which is more
suited to targets that use the generic linker hash table.  A tweak or
two to some testsuite predicates then gives a clean testsuite result
on the target.

	PR 24596
binutils/
	* testsuite/lib/binutils-common.exp (supports_gnu_unique): Add
	s12z to targets not supporting this feature.
ld/
	* emulparams/m9s12zelf.sh (TEMPLATE_NAME): Set to generic.
	(EXTRA_EM_FILE): Define to genelf.
	* testsuite/lib/ld-lib.exp (uses_genelf): Add s12z.