Replace SDL types by C99 standard types

Scrcpy is a C11 project. Use the C99 standard types instead of the
SDL-specific types:

    SDL_bool -> bool
    SintXX   -> intXX_t
    UintXX   -> uintXX_t

app/src/controller.h

@@ -3,8 +3,8 @@
 
 #include "control_event.h"
 
+#include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
-#include <SDL2/SDL_stdinc.h>
 #include <SDL2/SDL_thread.h>
 
 #include "net.h"
@@ -14,17 +14,17 @@ struct controller {
     SDL_Thread *thread;
     SDL_mutex *mutex;
     SDL_cond *event_cond;
-    SDL_bool stopped;
+    bool stopped;
     struct control_event_queue queue;
 };
 
-SDL_bool
+bool
 controller_init(struct controller *controller, socket_t video_socket);
 
 void
 controller_destroy(struct controller *controller);
 
-SDL_bool
+bool
 controller_start(struct controller *controller);
 
 void
@@ -34,7 +34,7 @@ void
 controller_join(struct controller *controller);
 
 // expose simple API to hide control_event_queue
-SDL_bool
+bool
 controller_push_event(struct controller *controller,
                       const struct control_event *event);