ld: Fix failures in new orphan handling tests.

ld: Fix failures in new orphan handling tests.

The new orphan handling tests added in commit c005eb9 fail on a range of
targets.  Some of the failures were fixed in commit e32aa93 but not
all.  This commit should address the remaining failures.

Update results to account for orphan sections being placed in different
orders, and for other, target specific sections, being discarded.

ld/testsuite/ChangeLog:

	* ld-elf/orphan-7.map: Allow for other discarded sections.
	* ld-elf/orphan-8.map: Updated to allow for different section
	ordering on different targets.
	* ld-elf/orphan.ld: Place .sbss section.