R:new warnings for mingw

[Paolo Carlini]

Hi,

> ../../../../gcc/libstdc++-v3/src/atomic.cc:55: warning: unused
> parameter '__x'
> ../../../../gcc/libstdc++-v3/src/atomic.cc:73: warning: unused
> parameter '__x'

These two should be fixed with the below. Tested x86_64-linux, applied to mainline.

Paolo.

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