ALLJOYN-1685 - Build googletest on android-x86

a. Use the correct include, lib paths and abi
   based on CPU=arm or CPU=x86
b. android-x86 does not have support for clone library call.
   See: docs/system/libc/CHANGES.html in Android NDK
   So explicitly inform googletest about that (GTEST_HAS_CLONE=0)

Change-Id: Ifd104e6c97774a2001191311be92a0bc7e325900