If NO_BIND_MTREE is set, we don't have anywhere to install the namedb files to, so don't try.
If NO_BIND_MTREE is set, we don't have anywhere to install the namedb files
to, so don't try.

The PR indicates that NO_BIND_NAMED would also trigger this problem, but
I was unable to reproduce it.

This is going directly to RELENG_6 because testing shows that HEAD is not
affected by this issue, likely due to the renovation of the make knobs
in that branch.

PR:		misc/97188
Submitted by:	Peter Losher <Peter_Losher@isc.org>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase