[packages] wing: Upgrade Wing package

Update wing package to latest version.

Signed-off-by: Roberto Riggio <roberto.riggio@create-net.org>
Signed-off-by: Vasilis Tsiligiannis <b_tsiligiannis@silverton.gr>

git-svn-id: svn://svn.openwrt.org/openwrt@35029 3c298f89-4303-0410-b956-a3cf2f4a3e73