[v3] --enable-extern-template

[Benjamin Kosnik]

C++0x linkage audit for "extern template" usage.

There is no behavior change here, just an additional group in the src
Makefile. The previous macro, _GLIBCXX_EXTERN_TEMPLATE is used as
before.

This patch allows building libstdc++.so/libstdc++.a
without extern template and the instantation files that are required
with it, by configuration with --disable-extern-template. 

tested x86/linux
tested x86_64/linux

-benjamin
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