#115 gifinter no longer included in giflib tarball

[Derek Atkins]

As of recent releases, gifinter is no longer included the giflib tarball.
It looks like this was done because it needs to get upgraded to the new library API, but for expediency it was just turned off from the build. There are several projects that were depending on gifinter. Please reinstate it.

[Eric S. Raymond]

Use the ImageMack conevert(1) tool. gifinter was removed in 2012.

I'm in the process of retiring as much of the tools part of the distribution as I can. If a job can be done by the ImageMagick suite, there's no good reason for it to live here.