allow use of unzip version 6.0
allow use of unzip version 6.0

Unzip 6.0 changes the name of the fourth column in the "unzip -lv"
output from "Ratio" to "Cmpr".  Allow either name so that
dump-package-stats works with both unzip 5 and unzip 6.

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