C++0x PATCH to comparison of noexcept specifications

[Jason Merrill]

While working on implicit move constructors, I've been running the 
testsuite with -std=gnu++0x, which turned up a bug whereby overriding a 
base method which can throw any exception with a derived method which is 
noexcept was giving an error about a looser exception spec.  Fixed thus.

Tested x86_64-pc-linux-gnu, applied to trunk.
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