env/windows: move dependencies to go-builder-data bucket
env/windows: move dependencies to go-builder-data bucket

response to comment in https://go-review.googlesource.com/c/51831/

Change-Id: Ib39ee31fc3e13db30e4f4fe2bd6465a0c4ae4e50
Reviewed-on: https://go-review.googlesource.com/52171
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build