Deleting unused build target.
Deleting unused build target.

This build target was used by webrtc/base:webrtc_base which is not a
build target anymore. Instead we have webrtc/base:rtc_base which depends
directly on third_party/boringssl.

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2926703003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18472}

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