Solaris emulation check

elf_solaris2_before_allocation can be called when ld output is non-ELF,
but also when ld output is ELF but not Solaris.  Split out from the
pr12320 fix due to the indentation change.

	PR 12320
	PR 33177
	* emultempl/solaris2.em (elf_solaris_before_allocation): Wrap
	everything done here in a more rigorous output hash table check.