remove dead code after split from openbsc.git
osmo-msc.git works as is, but it may still have large amounts of dead code that came along from openbsc.git.
gsm_data_shared.* and struct gsm_network come to mind, and various utility functions may not be used in osmo-msc.
Also, the gsup_client and oap_client are duplicated between osmo-msc and osmo-sgsn.
Review all code, remove unused struct members, drop unused functions, eliminate code dup where it makes sense.
Also verify the build, dependencies, installed files.