Debloat IVideoDriver and IrrlichtDevice includes (#15080)

As the project grows, compile time will not go down unless the header mess
is cleaned up one by one to only include exactly what's needed.

src/gui/profilergraph.h

@@ -23,9 +23,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <deque>
 #include <utility>
 #include <IGUIFont.h>
-#include <IVideoDriver.h>
 #include "profiler.h"
 
+namespace irr::video {
+	class IVideoDriver;
+}
+
 /* Profiler display */
 class ProfilerGraph
 {