Switch to using kati env script
Switch to using kati env script

Kati generates a shell script to run ninja, but that makes it difficult
to customize the ninja command line.  Switch to sourcing the new env
script and then starting ninja manually.

Change-Id: I7139290a463018ddf5e05b4d61a0d2f18b1a2247

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