This reverts commit d3d533c9.

Hard-coding -std=c++xy in one module is a bad idea.

None of these gccs give any spurious error in gnu++11 mode now:
gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
gcc (GCC) 4.7.0 20120507 (Red Hat 4.7.0-5)