Clear all LOCAL_CLANG_*FLAGS*.
Clear all LOCAL_CLANG_*FLAGS*.

Although only some of these flags will be used for some
targets or hosts, they must all be cleared to avoid carrying
over from one project to another.

BUG: 17677366
Change-Id: I6d26fa7e5bf2ff11758728810d4874f3759aebe7

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