[v3] libstdc++/52689

[Benjamin De Kosnik]

Seems like libstdc++.a has suffered a bit in the transition to a more
modular convenience-library build system. 

Here's a patch to clean up the compatibility symbols throughout
libstdc++, to insure that necessary symbols for versioning purposes are
only in shared binaries, ie libstdc++.so. Most of these are completely
un-necessary for a static library, and are now duly noted as such.

I'm checking this in on trunk and hope to move it to 4_7-branch for
4.7.1 after it's been fire-tested.

tested various ways x86/linux

-benjamin
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