Add back non-solaris ELF targets to solaris config

This reverses some of the changes made in config.bfd for PR 27666.
Removing targets for that PR was really just a workaround, and since
the underlying bug is now fixed they can be added back.

I chose to add the non-solaris ELF targets to the linker config using
targ_extra_emuls rather than targ_extra_libpath because someone using
the elf32_sparc emulation probably doesn't want to pick up solaris
libraries by accident.

	PR 33374
bfd/
	* config.bfd: Remove pr27666 comments.  Add back non-solaris
	ELF targets to selvecs for solaris targets.
ld/
	* configure.tgt: Adjust solaris targets to suit config.bfd
	change.