Removing unused variable OUTPUT_LIB
Removing unused variable OUTPUT_LIB

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2652553004
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16255}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: eaae505d0201e93f137b19efd89d78c02d80ea54

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