wget: update to v1.16

The update fixes CVE-2014-4877 which allows malicious FTP servers
to modify local filesystem contents through specificially crafted
symlinks.

Please backport to for-14.07 too.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
Merge pull request #483 from jow-/wget-1.16

wget: update to v1.16