Use descriptive path name for win_toolchain on the bots

Also includes an update of the go_deps asset from
https://skia-review.googlesource.com/c/skia/+/176996

Bug: skia:
Change-Id: I3b7abf746793d6a4883e1703d705847cadfe97e9
Reviewed-on: https://skia-review.googlesource.com/c/176973
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
8 files changed