new warnings for mingw

[NightStrike]

/home/nightstrike/build/gcc-svn/gcc/libstdc++-v3/../gcc/unwind-pe.h:74:
warning: 'unsigned int size_of_encoded_value(unsigned char)' defined
but not used
../../../../gcc/libstdc++-v3/src/atomic.cc:55: warning: unused parameter '__x'
../../../../gcc/libstdc++-v3/src/atomic.cc:73: warning: unused parameter '__x'


I don't recall seeing those three warnings in recent builds of the
toolchain.  They might have appeared from a recent change.