python3: Update to 3.4.2
gcc: Rebuild with fixed msys2-runtime to fix https://sourceforge.net/p/msys2/tickets/91/
readline: Rebuild with termcap instead ncurses to solve problems with interactive mode of applications
blender: Relocation WIP
hunspell: Rebuild.
git-git: Add option to use dscho's w64-msysgit branch
git-git: Rebase the msysgit patches