Make the update target consistent; both ports and doc are updated if their SUPFILE variables are defined _and_ NO_PORTSUPDATE and NO_DOCUPDATE respectively are not defined.
Make the update target consistent; both ports and doc are updated
if their SUPFILE variables are defined _and_ NO_PORTSUPDATE and
NO_DOCUPDATE respectively are not defined.

Previously, only ports was updated and there was no way to prevent
this without undefining its SUPFILE variable.

PR:		17514
Reported by:	Udo Erdelhoff <ue@nathan.ruhr.de>

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