Declare renderclient method as static.
The g++-4.8 compiler made me do this.
Comment out copy methode.

The method is already pure virtual.
fixed bug which caused shader precompilation to always fail
Merge branch 'develop' of github.com:vrsys/guacamole into develop
fixed non-copied shadow mode parameter
Version bump.
Merge branch 'release/v0.8.5' into develop
Merge remote-tracking branch 'upstream/develop' into develop