Update radvd to 1.8.5

Update radvd to 1.8.5

Radvd has been updated to 1.8.5 a few months ago, while Openwrt still uses
1.8.3. http://www.litech.org/radvd/

This patch updates radvd to 1.8.5. No major changes required.

signed off by: hannu.nyman@iki.fi

I send the patch again to make sure that Windows does not mess with LFs...
(not sure if that is needed, but Patchwork shows the previous one strangely)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@32565 3c298f89-4303-0410-b956-a3cf2f4a3e73