Patch the various recently reported security vulnerabilities in Mozilla.
This is being done instead of the update to 1.7.3 since the update breaks
all dependent ports, and that many changes is not a good thing to do during
a freeze.

This update covers the following Mozilla bugs:

245066
226669
250862
255067
256316
257317
258005

Thanks to nectar for scraping all of these patches together.

Obtained from: Mozilla CVS
Approved by: portmgr (implicit)