Support mouse cursor on RPI native

Reduced bunnymark limits

src/core.c

@@ -55,6 +55,9 @@
 *       WARNING: Reconfiguring standard input could lead to undesired effects, like breaking other running processes or
 *       blocking the device is not restored properly. Use with care.
 *
+*   #define SUPPORT_MOUSE_CURSOR_RPI (Raspberry Pi only)
+*       Draw a mouse reference on screen (square cursor box)
+*
 *   #define SUPPORT_BUSY_WAIT_LOOP
 *       Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used
 *
@@ -1187,6 +1190,12 @@ void BeginDrawing(void)
 // End canvas drawing and swap buffers (double buffering)
 void EndDrawing(void)
 {
+#if defined(PLATFORM_RPI) && defined(SUPPORT_MOUSE_CURSOR_RPI)
+    // On RPI native mode we have no system mouse cursor, so,
+    // we draw a small rectangle for user reference
+    DrawRectangle(mousePosition.x, mousePosition.y, 3, 3, MAROON);
+#endif
+    
     rlglDraw();                     // Draw Buffers (Only OpenGL 3+ and ES2)
 
 #if defined(SUPPORT_GIF_RECORDING)