[Lockfile] Encode checksums only if supported.
[Lockfile] Encode checksums only if supported.

orta/CocoaPods,Ashton-W/CocoaPods,vivekshukla-mob-ibtech/Repository,mglidden/CocoaPods,segiddins/CocoaPods,0xced/CocoaPods,mglidden/CocoaPods,ashfurrow/CocoaPods,mglidden/CocoaPods