Discussion page for Steam on Slackware

I'd like to recommend providing the following additional infos:

If the user is using the nvidia drivers using SlackBuild scripts on an x64 system, he should pass the option “compat32=yes”. Otherwise one gets rastsw errors on steam startup.
Also, the following library seems to be incompatible on 14.2. To solve this, either remove it or rename it:
```
~/.local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/removed_libstdc++.so.6
```