archivers/deutex: Update to 5.2.0 and unbreak
After many years of being dormant upstream has continued the development,
moved to GitHub and modernized the whole code base.
* Remove the patch for deutex.h that is no longer required. [1]
* Also take maintainership for a while.
Notable changes since the 4.4.0 release:
* Removed DeuSF binary and WinTex related features/options.
* PNG support added. If compiled in, it is the default extraction format,
PPM otherwise.
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