appdl: do not link with NFS library if networking is not configured for appdl.
drwxr-xr-x - gcc-patches
drwxr-xr-x - newlib-patches
drwxr-xr-x - rtems-build
drwxr-xr-x - rtems-omk-template
drwxr-xr-x - rtems-patches
drwxr-xr-x - rtems-tests