Added precompiled header support for Visual Studio and Xcode (#6710)

Fixes https://github.com/libsdl-org/SDL/issues/6704

src/timer/SDL_timer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../SDL_internal.h"
+#include "SDL_internal.h"
 
 #include "SDL_timer_c.h"
 #include "../thread/SDL_systhread.h"

src/timer/SDL_timer_c.h

@@ -22,7 +22,7 @@
 #ifndef SDL_timer_c_h_
 #define SDL_timer_c_h_
 
-#include "../SDL_internal.h"
+#include "SDL_internal.h"
 
 /* Useful functions and variables from SDL_timer.c */
 

src/timer/dummy/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #if defined(SDL_TIMER_DUMMY) || defined(SDL_TIMERS_DISABLED)
 

src/timer/haiku/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_HAIKU
 

src/timer/n3ds/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_N3DS
 

src/timer/ngage/SDL_systimer.cpp

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #if defined(SDL_TIMER_NGAGE)
 

src/timer/ps2/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_PS2
 

src/timer/psp/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_PSP
 

src/timer/unix/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_UNIX
 

src/timer/vita/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_VITA
 

src/timer/windows/SDL_systimer.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "../../SDL_internal.h"
+#include "SDL_internal.h"
 
 #ifdef SDL_TIMER_WINDOWS