Reserve room for ioctls that aren't in this copy of the driver yet.
Make the BSD-licensed patch the default.

The BSD-licensed patch(1) command has matured and it's behaviour
can be considered equivalent to the older version of GNU patch
in the tree.

The switch has been extensively tested [1] and only two ports
presented regressions, which have since been fixed.

For convenience a new WITH_GNU_PATCH option is available,
but it will likely be removed in the near future.

PR:		176313
Approved by:	portmgr