Fix warning for Android NDK compiler: "function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]"

https://stackoverflow.com/questions/42125/warning-error-function-declaration-isnt-a-prototype
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing.

(cherry picked from commit ccade50587)

test/testautomation_log.c

@@ -21,7 +21,7 @@ static void EnableTestLog(int *message_count)
     SDL_LogSetOutputFunction(TestLogOutput, message_count);
 }
 
-static void DisableTestLog()
+static void DisableTestLog(void)
 {
     SDL_LogSetOutputFunction(original_function, original_userdata);
 }