split the wrapper into multiple files + some generic wrapper cleanups
add support for new x86_64h architecture (haswell)
add support for multiple -arch flags with gcc (and clang + -oc-use-gcc-libs)
fix an unwind issue with -oc-use-gcc-libs + -mmacosx-version-min <= 10.5
update changelog
add support for the 10.10 SDK (DP1)
get rid of bc dependency
misc fixes
adjustments to allow extracting the sdk on linux (xcode 4.2 only)