patch for port: graphics/libungif

[Mark Martinec]

Please add the attached patch to graphics/libungif/files/

It fixes a segfault in the giftext utility during processing
of gif files with no color map (or a broken map).

The patch was provided by Christian Holler <decoder at own-hero.net>
and comes with his FuzzyOcr plugin to SpamAssassin.
The giftext utility became important to people using
SpamAssassin plugin FuzzyOcr.

Regards
   Mark
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