Update Python patches to use with MSYS2
Add support for Ada, ObjC and ObjC++ languages.
Add switch "--enable-languages" to specify what languages to build
Build MAKE with batch file because configure way is not correct now.
Update README.
Update mingw-w64 repository links
Fix building under MSYS2:
 - use english languages for display messages.
 - add patch for binutils that fixed building docs with texinfo-5.1.
 - fix running commands from current directory.
Update ISL to 0.12
Update xz-tools to 5.0.5
MSYS2 doesn't have problems with forks and now we can build GCC with many jobs. Also Ling GCC-4.7.2+ with "-large-address-aware"