This test now fails on mingw-w64 because it's no longer always true that
the mt19937 engine is used when _GLIBCXX_USE_DEV_RANDOM is not defined.

Add tests for all the known tokens to ensure that at least one is
accepted.

	* testsuite/26_numerics/random/random_device/cons/token.cc: Fix test
	that fails on mingw-w64.

From-SVN: r271756