[Buildroot] [PATCH 2/2] package/cegui: select libglu when libgl is detected

[Bernd Kuhls]

Am Tue, 28 Apr 2020 21:58:44 +0200 schrieb Bartosz Bilas:

> Fixes:
>   include/GL/glew.h:1205:14: fatal error: GL/glu.h: No such file or
>   directory

Cegui directly includes GL/glu.h:

https://github.com/cegui/cegui/blob/master/cegui/include/CEGUI/
RendererModules/OpenGL/GL.h#L49

which makes libglu a hard dependency for this package even when
-DGLEW_NO_GLU was added to CXXFLAGS.

Reviewed-off-by: Bernd Kuhls <bernd.kuhls at t-online.de>