[v3] libstdc++/52191

[Benjamin De Kosnik]

as requested. all new symbols should be in new symbol versoning names.
With this in, check-abi will now fail if new symbols are inadvertently
added to previously-released versions.

I'm expecting this to make solaris symbol versioning, as reported by
check-abi, fail at first. Then we can conditionalize the failing
symbols and add them in the newest version name on solaris, while
keeping them in the older places for systems like linux that supported
the functionality that added the symbols in earlier gcc releases.
That's the plan, at least.

tested x86/linux

-benjamin
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