[Lazarus] TOpenGLControl: multisampling not working (Linux/GLX)

[Michalis Kamburelis]

Mattias Gaertner wrote:
> Reimar sent me a patch that allocates a simple colormap, instead of
> the "sophisticated" gtkglext colormap. That seems to be enough for
> multisampling. :)
>

I can confirm that it also fixes the issue for me: now I can get 
multisampling in TOpenGLContext on both Radeon and NVidia on Linux 
(previously only Radeon was working for me).

Thank you!,
Michalis