Add FORCE_BUILD_RS_COMPAT option.
Add FORCE_BUILD_RS_COMPAT option.

This enables the .so libraries to be built for apps using the
RenderScript support library. Traditionally, we trim these .so
files from full platform builds.

Change-Id: I6f8e9b8d2b671338d3d5a5ac0bfcc60fd448688b

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