Use relative names in GN to make Chromium happy
Use relative names in GN to make Chromium happy

A recent CL (https://codereview.chromium.org/2388153004/) introduced absolute names, which caused Chromium builds
to fail.

TBR=kjellander@webrtc.org
BUG=webrtc:5801

Review-Url: https://codereview.webrtc.org/2446643005
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14755}

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