Guard autoupdater more completely

code/sys/sys_local.h

@@ -73,3 +73,7 @@ qboolean Sys_OpenFolderInPlatformFileManager( const char *path );
 #ifdef PROTOCOL_HANDLER
 char *Sys_ParseProtocolUri( const char *uri );
 #endif
+
+#ifdef USE_AUTOUPDATER
+void Sys_LaunchAutoupdater(int argc, char **argv);
+#endif