delete source files not in target
delete source files not in target

Incremental OTAs were not removing files from the old build that don't
exist in the new build.  Fix.

ND-3500/platform_manifest,RR-msm7x30/platform_manifest,Hybrid-Power/startsync,hagar006/platform_manifest,knone1/platform_manifest,xorware/android_build,xorware/android_build,xorware/android_build,fallouttester/platform_manifest,pranav01/platform_manifest,see4ri/lolili,xorware/android_build,xorware/android_build