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/scrcpy.h

@@ -1,7 +1,8 @@
 #ifndef SCRCPY_H
 #define SCRCPY_H
 
-#include <SDL2/SDL_stdinc.h>
+#include <stdbool.h>
+#include <stdint.h>
 #include <recorder.h>
 
 struct scrcpy_options {
@@ -9,17 +10,17 @@ struct scrcpy_options {
     const char *crop;
     const char *record_filename;
     enum recorder_format record_format;
-    Uint16 port;
-    Uint16 max_size;
-    Uint32 bit_rate;
-    SDL_bool show_touches;
-    SDL_bool fullscreen;
-    SDL_bool always_on_top;
-    SDL_bool no_control;
-    SDL_bool no_display;
+    uint16_t port;
+    uint16_t max_size;
+    uint32_t bit_rate;
+    bool show_touches;
+    bool fullscreen;
+    bool always_on_top;
+    bool no_control;
+    bool no_display;
 };
 
-SDL_bool
+bool
 scrcpy(const struct scrcpy_options *options);
 
 #endif