[v3] check-parallel fixes

[Benjamin Kosnik]

This fixes the LD_LIBRARY_PATH issue (#2) noticed here:
http://gcc.gnu.org/ml/libstdc++/2007-09/msg00046.html

To fix the issue with #3, libgomp will have to be configured/built
before libstdc++. That patch is pending.

tested x86/linux
tested x86/darwin
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