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/convert.h

@@ -1,8 +1,9 @@
 #ifndef CONVERT_H
 #define CONVERT_H
 
-#include <SDL2/SDL_stdinc.h>
+#include <stdbool.h>
 #include <SDL2/SDL_events.h>
+
 #include "control_event.h"
 
 struct complete_mouse_motion_event {
@@ -15,24 +16,24 @@ struct complete_mouse_wheel_event {
     struct point position;
 };
 
-SDL_bool
+bool
 input_key_from_sdl_to_android(const SDL_KeyboardEvent *from,
                               struct control_event *to);
 
-SDL_bool
+bool
 mouse_button_from_sdl_to_android(const SDL_MouseButtonEvent *from,
                                  struct size screen_size,
                                  struct control_event *to);
 
 // the video size may be different from the real device size, so we need the
 // size to which the absolute position apply, to scale it accordingly
-SDL_bool
+bool
 mouse_motion_from_sdl_to_android(const SDL_MouseMotionEvent *from,
                                  struct size screen_size,
                                  struct control_event *to);
 
 // on Android, a scroll event requires the current mouse position
-SDL_bool
+bool
 mouse_wheel_from_sdl_to_android(const SDL_MouseWheelEvent *from,
                                 struct position position,
                                 struct control_event *to);