omit mypy execution for win32
omit mypy execution for win32

chainer/chainer,okuta/chainer,keisuke-umezawa/chainer,niboshi/chainer,hvy/chainer,keisuke-umezawa/chainer,niboshi/chainer,hvy/chainer,okuta/chainer,niboshi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer,wkentaro/chainer,pfnet/chainer,okuta/chainer,chainer/chainer,niboshi/chainer,wkentaro/chainer,wkentaro/chainer,okuta/chainer,tkerola/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer