Use #ifdef/#ifndef instead of #if defined/#if \!defined

src/joystick/hidapi/SDL_hidapi_luna.c

@@ -32,7 +32,7 @@
 /*#define DEBUG_LUNA_PROTOCOL*/
 
 /* Sending rumble on macOS blocks for a long time and eventually fails */
-#if !defined(__MACOS__)
+#ifndef __MACOS__
 #define ENABLE_LUNA_BLUETOOTH_RUMBLE
 #endif
 

src/joystick/hidapi/SDL_hidapi_ps3.c

@@ -69,7 +69,7 @@ static SDL_bool HIDAPI_DriverPS3_IsEnabled(void)
 {
     SDL_bool default_value;
 
-#if defined(__MACOS__)
+#ifdef __MACOS__
     /* This works well on macOS */
     default_value = SDL_TRUE;
 #elif defined(__WINDOWS__)

src/joystick/hidapi/SDL_hidapi_steam.c

@@ -979,7 +979,7 @@ static SDL_bool HIDAPI_DriverSteam_InitDevice(SDL_HIDAPI_Device *device)
     }
     device->context = ctx;
 
-#if defined(__WIN32__)
+#ifdef __WIN32__
     if (device->serial) {
         /* We get a garbage serial number on Windows */
         SDL_free(device->serial);

src/joystick/hidapi/SDL_hidapi_wii.c

@@ -455,7 +455,7 @@ static void CheckMotionPlusConnection(SDL_DriverWii_Context *ctx)
 
 static void ActivateMotionPlusWithMode(SDL_DriverWii_Context *ctx, Uint8 mode)
 {
-#if defined(__LINUX__)
+#ifdef __LINUX__
     /* Linux drivers maintain a lot of state around the Motion Plus
      * extension, so don't mess with it here.
      */

src/joystick/hidapi/SDL_hidapi_xbox360.c

@@ -82,7 +82,7 @@ static SDL_bool HIDAPI_DriverXbox360_IsSupportedDevice(SDL_HIDAPI_Device *device
         return SDL_FALSE;
     }
 #endif
-#if defined(__MACOS__)
+#ifdef __MACOS__
     /* Wired Xbox One controllers are handled by this driver, interfacing with
        the 360Controller driver available from:
        https://github.com/360Controller/360Controller/releases

src/joystick/hidapi/SDL_hidapijoystick.c

@@ -561,7 +561,7 @@ static int HIDAPI_JoystickInit(void)
         return 0;
     }
 
-#if defined(SDL_USE_LIBUDEV)
+#ifdef SDL_USE_LIBUDEV
     if (linux_enumeration_method == ENUMERATION_UNSET) {
         if (SDL_getenv("SDL_HIDAPI_JOYSTICK_DISABLE_UDEV") != NULL) {
             SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,