tensorflow（ CPU only） 支持 windows 了

[lll9p]

虽然只是 CPU 版的。。

https://github.com/tensorflow/tensorflow/pull/4778

This PR contains an initial version of support for building TensorFlow
(CPU only) on Windows using CMake. It includes documentation for building
with CMake on Windows, platform-specific code for implementing core functions
on Windows, and CMake rules for building the C++ example trainer
program and a PIP package (Python 3.5 only). The CMake rules support building
TensorFlow with Visual Studio 2015.

[20015jjw]

真的作 换 unix 不就好了

[lll9p]

@20015jjw 支持 win 是好事啊

[ipwx]

@20015jjw 如果不是开发而是产品要用 TensorFlow ，你怎么看？