git version of msvc-setup.bat is not on haxelib

The version of msvc-setup.bat in the git repo works correctly with vs2017 Pro, but the version that is on haxelib doesn't. If you don't have older (or community) versions of msvc installed and use hxcpp from haxelib it cannot find HXCPP_VARS and the build will fail.
```

Warning: Could not find environment variables for Visual Studio
Missing HXCPP_VARS
Error: Could not automatically setup MSVC
```

Manually downloading msvc-setup.bat off git and applying it over my local install fixes everything though.