Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

If PORTNAME is set in a system Makefile then hook into the ports
mechanisms to allow a package to be created. This paves the way
for packaging the main tree.