Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_PSP

src/joystick/SDL_gamepad_db.h

@@ -998,7 +998,7 @@ static const char *s_GamepadMappings[] = {
 #ifdef SDL_JOYSTICK_PS2
     "0000000050533220436f6e74726f6c00,PS2 Controller,crc:ed87,a:b14,b:b13,back:b0,dpdown:b6,dpleft:b7,dpright:b5,dpup:b4,leftshoulder:b10,leftstick:b1,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b11,rightstick:b2,righttrigger:b9,rightx:a2,righty:a3,start:b3,x:b15,y:b12,",
 #endif
-#if SDL_JOYSTICK_PSP
+#ifdef SDL_JOYSTICK_PSP
     "00000000505350206275696c74696e00,PSP builtin joypad,crc:bb86,a:b2,b:b1,back:b10,dpdown:b6,dpleft:b7,dpright:b9,dpup:b8,leftshoulder:b4,leftx:a0,lefty:a1,rightshoulder:b5,rightx:a2,righty:a3,start:b11,x:b3,y:b0,",
 #endif
 #if SDL_JOYSTICK_VITA

src/joystick/psp/SDL_sysjoystick.c

@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_JOYSTICK_PSP
+#ifdef SDL_JOYSTICK_PSP
 
 /* This is the PSP implementation of the SDL joystick API */
 #include <pspctrl.h>