- updated to 4.0.3 (3.20.x left on MINGW-3 branch)
- upstream mingwrt and w32api tarballs have been combined (both have identical content),
  so build both mingw32-runtime (standard C API) and mingw32-w32api (Win32-specific API)
  packages from single spec
- removed obsolete stdinc patch
- merged mmsystem patch from crossmingw32-w32api
- added format patch