package/opkg-utils: remove build step
opkg-utils is a package that only provides bash and python scripts.
Upon further inspection of the Makefile for the package, invoking
`make` only ever builds the manpage. The previous commit dropped the
installation of the manpage. This makes the build step unnecessary so
remove it.
Add a comment to explain the situation
Signed-off-by: Ryan Barnett <ryan.barnett@rockwellcollins.com>
[yann.morin.1998@free.fr: reword commit log]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>