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.

• DeuTex can now build WADs with an arbitrary number of lumps, but prints a warning when more than 4046 are included (the Vanilla Doom limit).

• UDMF (Universal Doom Map Format) support.

• Real Autoconf and Automake build system to replace the barely-functioning imitation one.

• C99-style cleanups to use (u)intN_t types, bool, true, false throughout the code, replacing old defines. [1]

https://github.com/Doom-Utils/deutex/releases/tag/v5.2.0
https://github.com/Doom-Utils/deutex/releases/tag/v5.1.0
https://github.com/Doom-Utils/deutex/releases/tag/v5.0.0