Description of problem:

deutex does not have PNG support enabled at compile-time, but it probably should for convenience reasons. Some Doom WADs can use PNGs as source files (namely Freedoom).

Version-Release number of selected component (if applicable): 5.2.2


How reproducible: Should be reproducible on a fresh Fedora 34 installation.


Steps to Reproduce:

1. Install deutex from the Fedora repositories
2. Clone the Freedoom Git repository: `git clone https://github.com/freedoom/freedoom.git`
3. Run `make` in the cloned Freedoom repository.

Log:

```
❯ sudo dnf install deutex
Last metadata expiration check: 2:12:05 ago on Fri Jul 30 14:25:46 2021.
Dependencies resolved.
==========================================================================================================
 Package                Architecture           Version                       Repository              Size
==========================================================================================================
Installing:
 deutex                 x86_64                 5.2.2-2.fc34                  fedora                 121 k

Transaction Summary
==========================================================================================================
Install  1 Package

Total download size: 121 k
Installed size: 270 k
Is this ok [y/N]: y
Downloading Packages:
deutex-5.2.2-2.fc34.x86_64.rpm                                            558 kB/s | 121 kB     00:00    
----------------------------------------------------------------------------------------------------------
Total                                                                     146 kB/s | 121 kB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                  1/1 
  Installing       : deutex-5.2.2-2.fc34.x86_64                                                       1/1 
  Running scriptlet: deutex-5.2.2-2.fc34.x86_64                                                       1/1 
  Verifying        : deutex-5.2.2-2.fc34.x86_64                                                       1/1 

Installed:
  deutex-5.2.2-2.fc34.x86_64                                                                              

Complete!

~/Documents/Git/freedoom/freedoom mc776-master 6s
❯ make     
deutex does not support PNG. Try building deutex with the PNG
libraries (libpng and libpng-devel or similar packages) installed.
deutex can be downloaded from https://github.com/Doom-Utils/deutex.
The full path to duetex can be specified by passing
DEUTEX=/the/path/to/deutex to make when building Freedoom.
make: *** [Makefile:52: deutex-check] Error 1
```

Actual results:

PNG support is unavailable in deutex, which makes `make` abort with an error in the Freedoom Git repository.

Expected results:

PNG support is available in deutex, allowing Freedoom IWADs to be built without having to compile deutex manually.

Additional info: N/A