Removed SDL_bool in favor of plain bool

We require stdbool.h in the build environment, so we might as well use the plain bool type.

If your environment doesn't have stdbool.h, this simple replacement will suffice:
typedef signed char bool;

test/testsensor.c

@@ -108,7 +108,7 @@ int main(int argc, char **argv)
     SDL_Log("Opened %d sensors\n", num_opened);
 
     if (num_opened > 0) {
-        SDL_bool done = SDL_FALSE;
+        bool done = false;
         SDL_Event event;
 
         SDL_CreateWindow("Sensor Test", 0, 0, SDL_WINDOW_FULLSCREEN);
@@ -125,7 +125,7 @@ int main(int argc, char **argv)
                 case SDL_EVENT_MOUSE_BUTTON_UP:
                 case SDL_EVENT_KEY_UP:
                 case SDL_EVENT_QUIT:
-                    done = SDL_TRUE;
+                    done = true;
                     break;
                 default:
                     break;