filesystem: remove empty mingw root directories
filesystem: remove empty mingw root directories

I don't think they are actually needed anymore

JPeterMugaas/MSYS2-packages,mati865/MSYS2-packages,waterlan/MSYS2-packages,atom2013/MSYS2-packages,JPeterMugaas/MSYS2-packages,Alexpux/MSYS2-packages,mati865/MSYS2-packages,Alexpux/MSYS2-packages,atom2013/MSYS2-packages,atom2013/MSYS2-packages,waterlan/MSYS2-packages,JPeterMugaas/MSYS2-packages,mati865/MSYS2-packages,Alexpux/MSYS2-packages,JPeterMugaas/MSYS2-packages,waterlan/MSYS2-packages,waterlan/MSYS2-packages,atom2013/MSYS2-packages,mati865/MSYS2-packages,Alexpux/MSYS2-packages