Additional changes I needed to make it work:
- Modified a header in RTPFile.cc. Every other file is
using "webrtc/engine_configurations.h" instead.
- Disabled flag 4373 for msvs because it was disabled
in build/common.gypi.
BUG=webrtc:6038
TBR=kwiberg@webrtc.org
NOTRY=True
Review-Url: https://codereview.webrtc.org/2187563005
Cr-Commit-Position: refs/heads/master@{#13628}