style: require comma after __ADD() macro

  $ sed -i 's/^\([\t ]\+\<__ADD\> \?([^)]\+)\) *$/\1,/' `git grep -w -l __ADD`

Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>
style: add .indent.pro file for GNU indent

This is somewhat an approximation of the coding style
in libnl3. In the end, it does not work overly well,
but I think it will be useful to cherry-pick some automatic
style fixes.

Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>