How to clear confused package state

[Christopher Wolf]

I downloaded a 2.2.19 kernel and source a while back, and modified then 
built a new 2.2.19_di30 kernel from it that supports my tape drive.

For some reason, dselect has decided that the 2.2.19 kernel was updated, 
and it wants to update the package kernel-image-2.2.19 2.2.19-2 (using 
kernel-image-2.2.19_2.2.19-4potato.5_i386.deb)