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Static library android-support-v17-leanback references symbols
defined in android-support-v7-recyclerview.
Previously the core build system was set up with ProGuard config
"-dontwarn android.support.**" and we didn't detect the missing
dependencies. That setup is dangerous and is being fixed.

Bug: 20658265
Change-Id: I96f8cddb0bc486902a4df662d6aa7b2dc70135ff
(cherry picked from commit c9df1ba5)