ref: fix all undefined references

engine/client/cl_view.c

@@ -19,6 +19,7 @@ GNU General Public License for more details.
 #include "entity_types.h"
 #include "vgui_draw.h"
 #include "sound.h"
+#include "platform/platform.h" // GL_UpdateSwapInterval
 
 /*
 ===============
@@ -294,6 +295,8 @@ qboolean V_PreRender( void )
 	
 	ref.dllFuncs.R_BeginFrame( !cl.paused );
 
+	GL_UpdateSwapInterval( );
+
 	return true;
 }