Use dg-additional-options for -std={gnu99,c99}

Use dg-additional-options for -std={gnu99,c99}

2015-06-15  Tom de Vries  <tom@codesourcery.com>

	* testsuite/libgomp.c/collapse-3.c: Use dg-additional-options for
	-std={gnu99,c99}.
	* testsuite/libgomp.c/for-1.c: Same.
	* testsuite/libgomp.c/for-2.c: Same.
	* testsuite/libgomp.c/for-3.c: Same.
	* testsuite/libgomp.c/pr35625.c: Same.
	* testsuite/libgomp.c/pr39154.c: Same.
	* testsuite/libgomp.c/simd-16.c: Same.
	* testsuite/libgomp.c/simd-17.c: Same.

From-SVN: r224479