[testsuite] gcc.target/arm: skip 5 tests for flag conflicts

[Janis Johnson]

This patch adds test directives to skip 5 tests in gcc.target/arm if the
flags specified for the test would be overridden by or conflict with
flags used for all tests, such as multilib flags.

Tested on arm-none-eabi with a variety of test flags.  I'll wait a day
or two before checking it in to give ARM experts a chance to comment.
I plan to backport to the 4.7 branch soon after it's in trunk.

Janis
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