Anyone willing to take a look at this please. The main change here is just adding a Requires: gcc-c++ libstdc++-devel to prevent that in some corner cases where someone installing the Pattern devel_C_C++ won't ironically end up without a c++ compiler.

@WernerFink, @adamm, @dirkmueller, @elvigia, @hreinecke, @jengelh, @lrupp, @matz2, @msmeissn, @rguenther, @tiwai: review reminder