Bump version: 1.5.0.1-481fa → 1.5.1

This is just to make osmo-gtphub build against modern libosmocore,
which creates a naming clash about 'struct osmo_sockaddr'.

Related: OS#4710
Change-Id: I46043906d7f39d989f57bbdb5417e10d155a4d4d
1 file changed