[Warhammer 40,000: Gladius - Relics Of War] version `KEYUTILS_1.5' not found

**Game information**
Warhammer 40,000: Gladius - Relics Of War

**Distribution name and version where applicable**
Fedora 33 Silverblue

**Flatpak info**
```
$ flatpak --version
Flatpak 1.8.3
$ flatpak --gl-drivers
default
host
```

**Problem description**
When trying to start the game without any compatibility tool the game doesn't start and I see the following in log:
```
/var/home/zlopez/.local/share/Steam/steamapps/common/Warhammer 40000 Gladius - Relics of War/Binaries/Linux-x86_64/Gladius.bin: /var/home/zlopez/.local/share/Steam/ubuntu12_32/steam-runtime/lib/x86_64-linux-gnu/libkeyutils.so.1: version `KEYUTILS_1.5' not found (required by ./libkrb5.so.3)
```

**Does this issue reproduce with native Steam**
Have not tested

Start by reproducing the launch failure on Fedora 33 Silverblue and compare it with native Steam, which the report has not tested. Use the logged libkeyutils.so.1 and libkrb5.so.3 paths as the starting point; done means the KEYUTILS_1.5 mismatch has a verified resolution or a documented limitation.

Written by the indexing model from the issue text.