Include <SDL.h>

In theory this is the way to go according to https://nullprogram.com/blog/2023/01/08/

Let's see how many things break and how many I can fix…

src/logging.c

@@ -18,7 +18,7 @@
 #include "logging.h"
 
 #if HAVE_SDL2
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #endif
 
 #if (defined(__vita__) || defined(__PSL1GHT__)) && DEBUG

src/nx/nxVirtualKeyboard.c

@@ -17,7 +17,7 @@
 
 #include "../virtualKeyboard.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #include <switch.h>
 
 #include "../logging.h"

src/ps3/virtualKeyboard.c

@@ -17,7 +17,7 @@
 
 #include "../virtualKeyboard.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 #include <sys/memory.h>
 #include <sysutil/osk.h>

src/psp2/psp2VirtualKeyboard.c

@@ -17,7 +17,7 @@
 
 #include "../virtualKeyboard.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 #include <psp2/apputil.h>
 #include <psp2/display.h>

src/sdl2/controller.c

@@ -17,7 +17,7 @@
 
 #include "../controller.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #include <stdlib.h>
 
 static int sCurrentGameControllerIndex = -1;

src/sdl2/keyboard.c

@@ -17,7 +17,7 @@
 
 #include "../keyboard.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 #include "../system.h"
 

src/sdl2/touchscreen.c

@@ -17,7 +17,7 @@
 
 #include "../touchscreen.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 uint8_t readTouchScreen(float *x, float *y)
 {

src/sdl2/video.c

@@ -18,7 +18,7 @@
 #include "../video.h"
 
 #include <math.h>
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #include <stdlib.h>
 
 #include "../logging.h"

src/sdl_common/audio.c

@@ -20,7 +20,7 @@
 #include <math.h>
 
 #if HAVE_SDL2
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #if TARGET_OS_MAC
 #include <SDL2_mixer/SDL_mixer.h>
 #else

src/sdl_common/system.c

@@ -19,7 +19,7 @@
 
 #include <errno.h>
 #if HAVE_SDL2
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #elif HAVE_SDL
 #include <SDL/SDL.h>
 #endif

src/utils.c

@@ -20,7 +20,7 @@
 #include <string.h>
 
 #if HAVE_SDL2
-#include <SDL2/SDL.h>
+#include <SDL.h>
 #elif HAVE_SDL
 #include <SDL/SDL.h>
 #endif