a2e5c5c0f4
-I Use only the index file for determining if a package is out of
date. This is much faster than using the version number from a
port's Makefile, at the expense of potentially giving an incor-
rect result if the index file is out of date.
Without this option, the index file is only consulted if "make -V PKGNAME"
cannot be used.
Approved by: portmgr (krion)