gzdoom: 3.1.0 -> 3.2.5

Semi-automatic update. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 3.2.5 with grep in /nix/store/m0ms0fpwwi306zq5as89r1kb40bhba8n-gzdoom-3.2.5
- found 3.2.5 in filename of file in /nix/store/m0ms0fpwwi306zq5as89r1kb40bhba8n-gzdoom-3.2.5