[v3] libstdc++/21955 to gcc-4_0-branch

[Benjamin Kosnik]

This is a patch for gcc-4.0.2. It's a straightforward port of two
things: the fix for 21955, which has been in mainline for two months,
and the linkage solutions for compiling without extern templates.

tested x86/linux
tested x86/linux check-abi

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