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OPUS_GET_IN_DTX was added 2019-04-15, but we still need to support building on systems with older versions of the Opus headers (eg. Debian Jessie, released 2015-04-25). This is needed to fix the "Build From Tarball" bot [1]. [1] https://ci.chromium.org/p/infra/builders/cron/Build%20From%20Tarball BUG=chromium:1047860,webrtc:11085 R=minyue@webrtc.org,henrick.lundin@webrtc.org Change-Id: I5418c3caf4d2c7da9b9ba43ce85879b1e0eec6e6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168560 Reviewed-by: Minyue Li <minyue@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org> Cr-Commit-Position: refs/heads/master@{#30612}