arm64 : fix intptr_t size

engine/cmd.cpp

@@ -645,7 +645,7 @@ void Cmd_Exec_f( const CCommand &args )
 	ConDMsg( "execing %s\n", szFile );
 
 	// check to make sure we're not going to overflow the cmd_text buffer
-	int hCommand = s_CommandBuffer.GetNextCommandHandle();
+    CommandHandle_t hCommand = s_CommandBuffer.GetNextCommandHandle();
 
 	// Execute each command immediately
 	const char *pszDataPtr = f;