Add libosmo-netif to osmo-sysmon dependencies

This is in preparation for upcoming patch related to OpenVPN probe [1].

[1] change-id I4493e19b9a09dcebd289457eacd1719f7f8cc31c (osmo-sysmon)

Change-Id: I8532e9b0391bc3489cd9b53caced9f5bf0d3581f
1 file changed