- Various CMake improvements:
  * The toolchain files /usr/share/data/mingw/toolchain-mingw32.cmake
    and /usr/share/data/mingw/toolchain-mingw64.cmake don't have
    an uppercase character in their file name any more
  * Add CMAKE_SYSTEM_PROCESSOR to the CMake toolchain files
  * Removed Boost_COMPILER from the CMake toolchain files as
    it was unused and broken anyway
  * Made the RPM macros mingw32_cmake, mingw32_cmake_kde4,
    mingw64_cmake and mingw64_cmake_kde4 more generic
  * Removed the rpath references as mingw doesn't support rpath
  * Allow verbose CMake output to be disabled by setting the
    environment variable MINGW_CMAKE_NO_VERBOSE (RHBZ #987644)
  * When calling the mingw32-cmake and mingw64-cmake wrapper
    scripts don't use verbose CMake output by default
  * When using the CMake wrappers, prevent CFLAGS and CXXFLAGS
    from being set unless they're already set in the current
    environment (RHBZ #1136069)
  * Don't set LIB_INSTALL_DIR any more in the CMake macros
    as it breaks CPack and isn't needed by any of the
    Fedora MinGW packages (RHBZ #1152696)
- Accept empty MINGW{32,64}_{C,CPP,CXX}FLAGS environment variables
- Removed old _mingw32 macros which have been deprecated since Fedora 17