FUCHSIA: Import fuchsia-build and WORKSPACE.bazel

Copied from magma-dev branch.

Bug:460783239
Change-Id: I7c1a9acc270889a99e7f0d55835ddcd91ee4dd0d
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/1429539
Reviewed-by: David Gilhooley <dgilhooley@google.com>
Commit-Queue: Craig Stout <cstout@google.com>
27 files changed