[Android compile bot] Temporarily stop building external/skia
[Android compile bot] Temporarily stop building external/skia

Bug: skia:8489
Change-Id: I6bae4db2dd69a1d4f2e7a4143002903a9dd3b2b7
Reviewed-on: https://skia-review.googlesource.com/c/164140
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot