/usr/X11R6/lib/xscreensaver/fortune

Contains /usr/games/fortune as fortune binary, but when using the
fortune version from the fedora.us repository, fortune is
/usr/bin/fortune.

People not using fedora.us and having an old fortune from when redhat
was still shipping fortune however do have fortune as /usr/games/fortune

To make the problem more fun /usr/games/fortune does exist when using
the fortune package from fedora.us, but it is a directory, so the -x
test succeeds.

My bash isn't all that good, but this should be fixable easily by
testing for both fortunes and testing that /usr/games/fortune is not a
dir.