Remove tools dir from root webrtc target
Remove tools dir from root webrtc target

Removing it as we don't need it to build as part of webrtc target.

BUG=webrtc:6412
NOTRY=True

Review-Url: https://codereview.webrtc.org/2412353004
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14622}

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