Remove last mention of ortc from the codebase.
Remove last mention of ortc from the codebase.

TBR=kwiberg@webrtc.org

No-Try: True
Bug: webrtc:9824
Change-Id: I28af4b45a69b39cdc80ea4b21fef3716ded62a72
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/138269
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Reviewed-by: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28067}

TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc