This is the Pull-Request that resulted in the change: github.com/indilib/indi/pull/450
You can try to revert commits in your local fork and then compile.
Just an FYI on this issue that may help narrow down the bug.
After I do a capture and solve with sync, if I just right click on the center of the frame in Kstars and choose Eqmod Mount => sync (again), the drifting issue goes away.
The changes were reverted yesterday so today's PPA build should be OK. We still need to figure out to how to fix the IAS system, but for now the EQMod driver does not drift.