Description of problem:

When steam is started with the amdgpu driver, it reports several problems with being unable to load radeon related drivers.

Example:

libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
Installing breakpad exception handler for appid(steam)/version(1420770381)

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


How reproducible:


Steps to Reproduce:
1. Install steam on a computer using amdgpu graphic driver.  
2. Type "steam" in an xterm.
3. The above messages go to the screen and steam hangs.
4. If you "killall steam", the steam runtime is downloaded and re-run.  A second killall terminates steam.

I believe he problem has to do with libgpg-error and a few other system libraries that come with the steam runtime.  

To work around this I use this line:

find ~/.local/share/Steam/ -name "libgcc_s.so*" -o -name "libstdc++.so*" -o -name "libxcb.so*" -o -name "libgpg-error.so*" -print -delete

which deletes the delivered system libraries.

Once the libraries are gone, steam starts and runs fine.