Cleanup libc++ configuration.
Cleanup libc++ configuration.

Change-Id: Id1eeeb23466b04a4fe64c04e1768b98a1068b5a8
(cherry picked from commit 0ad5bd22c898cbf0e8d1e156dace080f4e11a0a1)

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