Remove libportable from core_base.mk.
Remove libportable from core_base.mk.

(cherry picked from commit 4e8c6991e534fdb5901c6d31d7181a0d071317f4)

Change-Id: Icefe7dccbca87798d4ec0761bf90aa169253839e

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build