Looks like this is not needed, so make the jenkins build work without
installing dahdi-source.
Related: OS#5863
Change-Id: I61c483983a4793e0429bb37804dee0a128125daf
This library will be used soon when adding Osmux support to osmo-bts.
Furthermore, it nice to have it available to make use of other general
interfaces to create connections, primitives, RTP and AMR related
functionalities, etc.
Related: SYS#5987
Change-Id: I49db4de715065c083e1249cbeae6298d6868e229