RFA: v3 PATCH to add on_quick_exit/quick_exit to std

[Jason Merrill]

While I was going over the C++11 status page, I noticed that quick_exit 
is implemented by glibc, it just needed to be added to the libstdc++ 
cstdlib header.

Does this configury/feature macro handling look right?  Is this enough 
testcase?  Is this small/safe enough to go in for 4.8?
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