Stash original values of CC and CXX.
Stash original values of CC and CXX.

This way we can still access the real compiler as opposed to a wrapped
one.

Change-Id: I17ba30416a3eb8eda056c67faaa8b5957e70caea

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