Log Message:
The contents of include/bind vary widly between systems as bind9
dutifully installs whatever it thinks might be missing or just
substandard on the current system.
As the Makefile already adds the contents of share/doc/bind9
dynamically to the PLIST, do the same for include/bind.
Fixes the PLIST on RedHat EL 2 & 3, and does not break it on NetBSD/3
No PKGREVISION bump as no change to anything but generated PLIST