games/cube: Unbreak with Clang 6
clients2c.cpp:259:45: error: non-constant-expression cannot be narrowed from type
'short' to 'float' in initializer list [-Wc++11-narrowing]
vec v = { ents[i].x, ents[i].y, ents[i].z };
^~~~~~~~~clients2c.cpp:352:20: warning: ISO C++11 does not allow conversion from string
literal to 'char *' [-Wwritable-strings]
neterr("type");
^http://beefy12.nyi.freebsd.org/data/head-amd64-default/p475044_s336572/logs/cube-2005.08.29_17.log
- Add missing GL dependency