fwmod:
 * do not use hardcoded {{{build/modified/external}}} while collecting the list of externalized files (it's incorrect when fwmod is called not from within freetz environment), use the corresponding variable instead


git-svn-id: file:///var/svn/freetz/trunk@12054 149334a1-2f27-0410-a3b9-fc62619ac1e6