ld/testsuite/ld-unique: Fix running unique tests on ARM

ld/testsuite/ld-unique: Fix running unique tests on ARM

The @ character is a comment character on ARM, so use % instead. Also
use a wider glob for matching ARM targets to make sure the test gets
run.

ld/testsuite/ChangeLog:

2014-10-30  Will Newton  <will.newton@linaro.org>

	* ld-unique/unique.exp: Use a wider glob for matching ARM
	targets.
	* ld-unique/unique.s: Use % instead of @ in .type directive.
	* ld-unique/unique_shared.s: Likewise.