samba4 broken by the latest update due to a conflict with tdb which is made a dependency

[barracuda156]

The following commit makes tdb a dependency of samba4: ​https://github.com/macports/macports-ports/commit/73d863cea54b753e4edb424b15984ce0f4043f01

However, now samba4 cannot be activated, since these ports conflict. Specifically, this file is installed by both: /opt/local/bin/tdbbackup.

Port tdb @1.4.10_0 contains:
  /opt/local/bin/tdbbackup
  /opt/local/bin/tdbdump
  /opt/local/bin/tdbrestore
  /opt/local/bin/tdbtool
  /opt/local/include/tdb.h
  /opt/local/lib/libtdb.1.4.10.dylib
  /opt/local/lib/libtdb.1.dylib
  /opt/local/lib/libtdb.dylib
  /opt/local/lib/pkgconfig/tdb.pc
  /opt/local/share/man/man8/tdbbackup.8.gz
  /opt/local/share/man/man8/tdbdump.8.gz
  /opt/local/share/man/man8/tdbrestore.8.gz
  /opt/local/share/man/man8/tdbtool.8.gz