ports/foo2zjs: mark the port as MAKE_JOBS_UNSAFE

Error log:

chmod -w osx-hplj-hotplug.1

chmod: osx-hplj-hotplug.1: No such file or directory

Full log is here:
https://jenkins.freebsd.org/pci/100-amd64/logs/bulk/100amd64-default/569/logs/errors/foo2zjs-20140401_1.log

Reported by: jenkins (swills)
MFH: 2014Q2