ref: remove unused GL_BuildLightmaps export

engine/ref_api.h

@@ -575,8 +575,6 @@ typedef struct ref_interface_s
 
 	// passed through R_RenderFrame (0 - use engine renderer, 1 - use custom client renderer)
 	int		(*GL_RenderFrame)( const struct ref_viewpass_s *rvp );
-	// build all the lightmaps on new level or when gamma is changed
-	void		(*GL_BuildLightmaps)( void );
 	// setup map bounds for ortho-projection when we in dev_overview mode
 	void		(*GL_OrthoBounds)( const float *mins, const float *maxs );
 	// grab r_speeds message

ref_gl/gl_context.c

@@ -495,7 +495,6 @@ ref_interface_t gReffuncs =
 	R_StudioGetTexture,
 
 	R_RenderFrame,
-	GL_BuildLightmaps,
 	Mod_SetOrthoBounds,
 	R_SpeedsMessage,
 	Mod_GetCurrentVis,