Make all tasks specify an OS version

Rename Win->Win10 where appropriate

BUG=skia:

Change-Id: I8692340cebf646e2cb0cb825e808b5ea1b695a8f
Reviewed-on: https://skia-review.googlesource.com/5356
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
tree: e8604bbe4f17137f2d314043625d90e42c5d7323
  1. recipe_modules/
  2. recipes.py
  3. recipes/