testsuite: Fix Wattributes test cases for s390 and add new tests.

There are several FAILs because we have an s390-specific check for a
warning which is not necessary anymore.  Remove it.

Add a new test case that expects a warning about conflicting function
alignment.  This would fail on s390 before but most likely on other
targets as well so it can be a target-independent test.

Also, add a test to verify that we do not emit a note when specifying
conflicting alignment for the same declaration.  Need to explicitly
handle every dg-note because handling one disables dg-note pruning.

gcc/testsuite/ChangeLog:

	* c-c++-common/Wattributes.c: Remove s390-specific check and add
	new tests.
	* gcc.dg/Wattributes-6.c: Likewise.

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