Bug#907125: steam: Missing libtxc-dxtn-s2tc0 dependency

[Luiz Romário Santana Rios]

Package: steam
Version: 1.0.0.54-2
Severity: important

The libtxc-dxtn-s2tc0 (and possibly libtxc-dxtn-s2tc0:i386) package is
necessary for Steam to work properly. Without them, a lot of steam games
get black backgrounds and images, redering them unplayable. However,
these packages are not steam dependencies.

Source: https://ubuntuforums.org/showthread.php?t=2359316

-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-8-amd64 (SMP w/8 CPU cores)
Locale: LANG=pt_BR.UTF-8, LC_CTYPE=pt_BR.UTF-8 (charmap=UTF-8), LANGUAGE=pt_BR:pt:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages steam depends on:
ii  debconf [debconf-2.0]            1.5.61
ii  libc6                            2.24-11+deb9u3
ii  libgl1-mesa-dri                  13.0.6-1+b2
ii  libgl1-mesa-glx                  13.0.6-1+b2
ii  libgpg-error0                    1.26-2
ii  libstdc++6                       6.3.0-18+deb9u1
ii  libtxc-dxtn-s2tc [libtxc-dxtn0]  1.0+git20151227-2
ii  libudev1                         232-25+deb9u4
ii  libx11-6                         2:1.6.4-3
ii  libxinerama1                     2:1.1.3-1+b3
ii  xz-utils                         5.2.2-1.2+b1

Versions of packages steam recommends:
ii  fonts-liberation               1:1.07.4-2
ii  konsole [x-terminal-emulator]  4:16.12.0-4
ii  libxss1                        1:1.2.2-1
ii  xterm [x-terminal-emulator]    327-2
ii  zenity                         3.22.0-1+b1

Versions of packages steam suggests:
pn  steam-devices  <none>

-- debconf information:
* steam/question: I AGREE
  steam/purge:
* steam/license: