Update to gcc 4.7 20120224 snapshot and perform a bootstrap build
- Update to gcc 4.7 20120224 snapshot
- Perform a bootstrap build using mingw-w64
- Dropped the /lib/i686-pc-mingw32-cpp symlink
- Dropped the float.h patch as it isn't needed anymore with mingw-w64
- Added some patches which upstream mingw-w64 recommends us to apply