F22 System Wide Change: GCC5

[Jakub Jelinek]

Hi!

As FESCO denied mass rebuild of F22, I've adjusted
https://fedoraproject.org/wiki/Changes/GCC5
the current rpms are built with --with-default-libstdcxx-abi=c++98
thus will not have standard conforming std::string/std::list by default,
and I'd like to include gcc 5 in F22 anyway, just only what maintainers
rebuild themselves after gcc 5 is included will be rebuilt with it.

	Jakub