audio/umurmur needs updating

[Aaron Hurt]

This port was added but has not been updated.  When I created the following
PR ( http://www.freebsd.org/cgi/**query-pr.cgi?pr=157100<http://www.freebsd.org/cgi/query-pr.cgi?pr=157100>
)
... this port wasn't in the repository yet.  Please commit the newer version
of this port found at the link provided.  I'd also be glad to takeover
ownership of this port as I already maintain it's dependency
devel/protobuf-c

Thank You