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/recorder.h

@@ -1,8 +1,8 @@
 #ifndef RECORDER_H
 #define RECORDER_H
 
+#include <stdbool.h>
 #include <libavformat/avformat.h>
-#include <SDL2/SDL_stdinc.h>
 
 #include "common.h"
 
@@ -16,23 +16,23 @@ struct recorder {
     enum recorder_format format;
     AVFormatContext *ctx;
     struct size declared_frame_size;
-    SDL_bool header_written;
+    bool header_written;
 };
 
-SDL_bool
+bool
 recorder_init(struct recorder *recoder, const char *filename,
               enum recorder_format format, struct size declared_frame_size);
 
 void
 recorder_destroy(struct recorder *recorder);
 
-SDL_bool
+bool
 recorder_open(struct recorder *recorder, AVCodec *input_codec);
 
 void
 recorder_close(struct recorder *recorder);
 
-SDL_bool
+bool
 recorder_write(struct recorder *recorder, AVPacket *packet);
 
 #endif