Kernel headers break when musl defines IFF_LOWER_UP. While
waiting for more proper fix in musl, add a workaround to connman.
(From OE-Core rev: e6178138968717e1bdb7af7b5aed42fc74d956ab)
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>