[PATCH] Replace unsupported effective-target with dg-options

[Jonathan Wakely]

I accidentally backported tests using { target c++11 } to the branch,
but that only works on trunk. One test was also using C++14-only
features, but is meant to be valid in C++11.

	* testsuite/24_iterators/reverse_iterator/71771.cc: Replace calls to
        C++14 std::rbeing and std::rend. Use dg-options instead of
        effective-target.
	* testsuite/27_io/headers/cstdio/functions_neg.cc: Likewise.
	* testsuite/experimental/numeric/77801.cc: Likewise.

Tested x86_64-linux, committed to gcc-6-branch.

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