serf: extend for nativesdk
As an unconditionally dependency of subversion, extend serf recipe for
building a nativesdk variant being usable by nativesdk-subversion.
Signed-off-by: Jens Rehsack <sno@netbsd.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ff731a25a49c768f04a474438efccb3bb505a898)
Signed-off-by: Steve Sakoman <steve@sakoman.com>