Master build breaks --without-ad-dc and bundled heimdal

[Uri Simchoni]

When building master --without-ad-dc and bundled heimdal, I get the 
following error when the build begins:

Checking project rules ...
Unknown dependency 'HDB_SAMBA4' in 'python_dckeytab.objlist'

To reproduce (FC23 but probably others too):
./configure --without-ad-dc
make

No problems with 4.4.0.

The immediate suspect would be mit-kdb addition, commit 
ade958e20b561b702e2fec86a28659144dbe4a9e, but I can't see the link. I'm 
bisecting to find the commit, but if someone more familiar with this 
area of the code can do an "Aha!" and save me the work I'd be grateful.

Thanks,
Uri.