[PATCH 2/2] Adjust DG directives in libstdc++ XFAIL test

[Jonathan Wakely]

Another patch tweaking directives, and replacing -std with an
effective target.

    Adjust DG directives in libstdc++ Profile Mode test
    
    	* testsuite/ext/profile/all.cc: Use effective target instead of
    	-std=gnu++11. Use dg-additional-options instead of repeating options.

Tested powerpc64le-linux, committed to trunk.

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