I retested the game with mesa 12.0.6 and xserver-xorg-video-radeon 1:7.7.1 (the
current versions for default Lubuntu 16.10) and noticed that while the game
doesn't crash, it still produces buffer allocation failures during startup:

   2.969 Initial atlas bitmap size is 8192
radeon: Failed to allocate a buffer:
radeon:    size      : 268435456 bytes
radeon:    alignment : 16384 bytes
radeon:    domains   : 4
radeon:    flags     : 20
radeon: Failed to allocate a buffer:
radeon:    size      : 268435456 bytes
radeon:    alignment : 16384 bytes
radeon:    domains   : 4
radeon:    flags     : 20
radeon: Failed to allocate a buffer:
radeon:    size      : 268435456 bytes
radeon:    alignment : 16384 bytes
radeon:    domains   : 4
radeon:    flags     : 20
radeon: Failed to allocate a buffer:
radeon:    size      : 268435456 bytes
radeon:    alignment : 16384 bytes
radeon:    domains   : 4
radeon:    flags     : 20
   3.029 Couldn't create atlas bitmap (size 8192x8182), will try again
   3.094 Created atlas bitmap 4096x4096