SDL_bsdjoystick: fix OpenBSD build error due to -Wundef

src/joystick/bsd/SDL_bsdjoystick.c

@@ -78,7 +78,7 @@
 #include "../SDL_joystick_c.h"
 #include "../hidapi/SDL_hidapijoystick_c.h"
 
-#if defined(__FREEBSD__) || SDL_HAVE_MACHINE_JOYSTICK_H || defined(__FreeBSD_kernel__) || defined(__DragonFly_)
+#if defined(__FREEBSD__) || defined(SDL_HAVE_MACHINE_JOYSTICK_H) || defined(__FreeBSD_kernel__) || defined(__DragonFly_)
 #define SUPPORT_JOY_GAMEPORT
 #endif