Add SDL_gamepad.inc

Author: Free-Pascal-meets-SDL-Website

units/SDL3.pas

@@ -98,6 +98,7 @@ interface
 {$I SDL_mouse.inc}                        // 3.1.6-prev
 {$I SDL_keyboard.inc}                     // 3.1.6-prev
 {$I SDL_joystick.inc}                     // 3.1.6-prev
+{$I SDL_gamepad.inc}                      // 3.2.0
 {$I SDL_pen.inc}                          // 3.1.6-prev
 {$I SDL_touch.inc}                        // 3.1.6-prev
 {$I SDL_camera.inc}                       // 3.1.6-prev