deltarpm for Rawhide kernel not working

[Andre Robatino]

The last few Rawhide kernel deltarpms haven't worked. Each one has messages
like

/lib/modules/3.2.0-0.rc7.git4.1.fc17/x86_64/modules.alias: contents have been
changed

and a list of similar messages for other modules.* files in the same directory,
then

delta does not match installed data

so the full RPM is downloaded instead. Why is this happening?