[lavapipe] Add wsi:stub target.

Change-Id: I753a9f15fb7f367fafaff4d0fbd0fdc6ddda3494
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/990367
Reviewed-by: Josh Gargus <jjosh@google.com>
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/1005914
Reviewed-by: Alice Neels <neelsa@google.com>
Commit-Queue: Josh Gargus <jjosh@google.com>
1 file changed