fix Windows build

Reviewed By: yns88

Differential Revision: D33850004

fbshipit-source-id: f01c3508c91049c3fc4f72bec14683b50332df77

build/fbcode_builder/manifests/fbthrift

@@ -19,10 +19,13 @@ fizz
 fmt
 googletest
 libsodium
-python
 python-six
 zstd
 
+[dependencies.not(os=windows)]
+# python doesn't build on Windows yet
+python
+
 [shipit.pathmap]
 fbcode/thrift/public_tld = .
 fbcode/thrift = thrift