In last batch of bsd.port.mk updates, old REINPLACE_CMD handling was removed.
Now the whole code consists of setting two make variables.
Because it no longer includes any external dependencies, I do propose to have
REINPLACE_CMD defined all the time, and that we remove USE_REINPLACE.
After this is committed, we can start removing USE_REINPLACE from individual
ports, slowly, over time.
Tasty sausages for portmgr (clement)
Accepted for testing on the cluster.