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Xcode 10 obscures compile failures when build output includes relative paths,
and our xctest-build-sources fail to compile.  Disable build system for now.

Bug: 852522
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ice0e5c7e6734270f804ae0f8a21cf5621ff13f58
Reviewed-on: https://chromium-review.googlesource.com/1182143Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584722}