Switch most Win Vulkan jobs to Clang.

Update examples in recipes.

Change-Id: I096f259e8daa46af8626158a820fe226e99cd159
Reviewed-on: https://skia-review.googlesource.com/58200
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
21 files changed