The iputils build system embeds git tags into the generated binaries
for use by commands like ping -V.  Since openwrt packaging is done in
a different repository from the upstream repo, the tags it finds
aren't particularly meaningful, and we get confusing results like
those described at https://github.com/openwrt/packages/issues/13920

This change removes the git tag inspection in favor of the static
version string that's already known to the upstream build system.

Signed-off-by: Noah Meyerhans <frodo@morgul.net>

Move the tftpd binary from /usr/bin to /usr/sbin per upstream.

Signed-off-by: Noah Meyerhans <frodo@morgul.net>

Signed-off-by: Noah Meyerhans <frodo@morgul.net>

Per discussion in https://github.com/openwrt/openwrt/pull/1804, iputils is
moving from the main openwrt repository to the packages feed, and is switching
from the abandoned skbuff.net upstream to github.com/iputils/iputils

Signed-off-by: Noah Meyerhans <frodo@morgul.net>