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/file_handler.h

@@ -1,9 +1,10 @@
 #ifndef FILE_HANDLER_H
 #define FILE_HANDLER_H
 
+#include <stdbool.h>
 #include <SDL2/SDL_mutex.h>
-#include <SDL2/SDL_stdinc.h>
 #include <SDL2/SDL_thread.h>
+
 #include "command.h"
 
 #define REQUEST_QUEUE_SIZE 16
@@ -24,19 +25,19 @@ struct file_handler {
     SDL_Thread *thread;
     SDL_mutex *mutex;
     SDL_cond *event_cond;
-    SDL_bool stopped;
-    SDL_bool initialized;
+    bool stopped;
+    bool initialized;
     process_t current_process;
     struct request_queue queue;
 };
 
-SDL_bool
+bool
 file_handler_init(struct file_handler *file_handler, const char *serial);
 
 void
 file_handler_destroy(struct file_handler *file_handler);
 
-SDL_bool
+bool
 file_handler_start(struct file_handler *file_handler);
 
 void
@@ -45,7 +46,7 @@ file_handler_stop(struct file_handler *file_handler);
 void
 file_handler_join(struct file_handler *file_handler);
 
-SDL_bool
+bool
 file_handler_request(struct file_handler *file_handler,
                      file_handler_action_t action,
                      const char *file);