Workaround caroline vmtest problems.

With this change we still build vulkan library on caroline. And we run
vmtest on a newer Intel board (samus). Coverage with this change should
be practically unchanged.

TEST=None.
BUG=chromium:708715

Change-Id: I8ddbc682a5c625b3dc8232559dfb02a13db64bd9
Reviewed-on: https://chromium-review.googlesource.com/472069
Tested-by: Ilja H. Friedel <ihf@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed