am 4cb90b7e: (-s ours) DO NOT MERGE TO MR2 RIO-7939: Change H.263 encoding default GOB header interval to 0 Cherry-picked from MR2

Merge commit '4cb90b7e64db457698b33a852dd16b0cae2e69ed' into eclair-mr2

* commit '4cb90b7e64db457698b33a852dd16b0cae2e69ed':
  DO NOT MERGE TO MR2