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Add the first actually useful lookup method to the mslookup library: multicast DNS. The server side is added in a subsequent commit, when the mslookup server is implemented for the osmo-hlr program. Use custom DNS encoding instead of libc-ares (which we use in OsmoSGSN already), because libc-ares is only a DNS client implementation and we will need both client and server. Resubmit off10463c5fcafter being reverted in110a49f69f. This new version skips the mslookup_client_mdns test if multicast is not supported in the build environment. I have verified that it doesn't break the build anymore in my own OBS namespace. Related: OS#4237, OS#4361 Patch-by: osmith, nhofmeyr Change-Id: I3c340627181b632dd6a0d577aa2ea2a7cd035c0c