Readability: remove const-qualifation from function declaration

const-qualification of parameters only has an effect in function definitions

src/SDL.c

@@ -56,7 +56,7 @@ extern int SDL_HelperWindowDestroy(void);
 /* This is not declared in any header, although it is shared between some
     parts of SDL, because we don't want anything calling it without an
     extremely good reason. */
-extern SDL_NORETURN void SDL_ExitProcess(const int exitcode);
+extern SDL_NORETURN void SDL_ExitProcess(int exitcode);
 SDL_NORETURN void SDL_ExitProcess(const int exitcode)
 {
 #ifdef __WIN32__

src/SDL_assert.c

@@ -121,10 +121,10 @@ static void SDL_GenerateAssertionReport(void)
     parts of SDL, because we don't want anything calling it without an
     extremely good reason. */
 #if defined(__WATCOMC__)
-extern void SDL_ExitProcess(const int exitcode);
+extern void SDL_ExitProcess(int exitcode);
 #pragma aux SDL_ExitProcess aborts;
 #endif
-extern SDL_NORETURN void SDL_ExitProcess(const int exitcode);
+extern SDL_NORETURN void SDL_ExitProcess(int exitcode);
 
 
 #if defined(__WATCOMC__)

src/dynapi/SDL_dynapi.c

@@ -280,10 +280,10 @@ static void dynapi_warn(const char *msg)
     parts of SDL, because we don't want anything calling it without an
     extremely good reason. */
 #if defined(__WATCOMC__)
-void SDL_ExitProcess(const int exitcode);
+void SDL_ExitProcess(int exitcode);
 #pragma aux SDL_ExitProcess aborts;
 #endif
-SDL_NORETURN void SDL_ExitProcess(const int exitcode);
+SDL_NORETURN void SDL_ExitProcess(int exitcode);
 
 
 static void