Another Steam Update breaks Ubuntu Xenial 16.04

As of the recent Steam update, Steam will not launch and the following is displayed:

$ steam
Setting up Steam content in /home/username/.local/share/Steam
Running Steam on ubuntu 16.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0)
libGL error: unable to load driver: r600_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r600
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast

You can fix it with:

mv .local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libstdc++.so.6 .local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libstdc++.so.6.old
mv .local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19 .local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19.old
mv .local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6 .local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6.old
mv .local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6.0.19 .local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6.0.19.old

This is yet another instance of the C++ libraries in the Steam Runtime not being compatible with the free software radeon driver for AMD (ATI) graphics cards:

https://github.com/ValveSoftware/steam-for-linux/issues/3273

I had a previous fix for this when they just packaged the i386 C++ library, but now they're packaging both the i386 and AMD64 C++ library, so my fix needed updating.

If Valve package one more C++ library that'll be 3 separate libraries: Half-Life 3 confirmed.