fix missing type definitions

src/mod/applications/mod_mp4/mp4_helper.cpp

@@ -22,6 +22,7 @@ Contributors:
 	Seven Du <dujinfang@gmail.com>
 */
 
+#include <switch.h>
 #include "mp4_helper.hpp"
 
 namespace MP4
@@ -132,4 +133,4 @@ namespace MP4
 		++rt.packet;
 		return true;
 	}
-}
+}
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