Increase rtp_file_reader line length to support ipv6.
Increase rtp_file_reader line length to support ipv6.

Bug: webrtc:8075
Change-Id: Ic4d90fb2e77e95f9c8a49557d8c8eaff881f8e2b
Reviewed-on: https://webrtc-review.googlesource.com/44300
Reviewed-by: Erik Språng <3ab8c90c99d6dd7822e0fad803ab0211dd287ae5@webrtc.org>
Commit-Queue: Stefan Holmer <eb0877843acc39f8ef6f7269937dee931c372d23@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#21798}
TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc