ref: gl: remove hidden parm -gl-allow-vbo-dontuse needed to activate VBO renderer

ref/gl/gl_rsurf.c

@@ -1870,7 +1870,7 @@ void R_GenerateVBO( void )
 	R_ClearVBO();
 
 	// we do not want to write vbo code that does not use multitexture
-	if( !GL_Support( GL_ARB_VERTEX_BUFFER_OBJECT_EXT ) || !GL_Support( GL_ARB_MULTITEXTURE ) || glConfig.max_texture_units < 2 || !gEngfuncs.Sys_CheckParm("-gl-allow-vbo-dontuse") )
+	if( !GL_Support( GL_ARB_VERTEX_BUFFER_OBJECT_EXT ) || !GL_Support( GL_ARB_MULTITEXTURE ) || glConfig.max_texture_units < 2 )
 	{
 		gEngfuncs.Cvar_FullSet( "gl_vbo", "0", FCVAR_READ_ONLY );
 		return;