debian: Do not depend on shared libraries directly

The debian shlibs:depends macro will add the depends
according to the needed libraries for us. We only need
this for the sqlite3 plugin of libdbi-drivers as there
is no direct linkage.
diff --git a/debian/control b/debian/control
index a11ddab..32c75db 100644
--- a/debian/control
+++ b/debian/control
@@ -10,43 +10,43 @@
 
 Package: osmocom-bsc
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore, libosmo-sccp
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: GSM Base Station Controller; BSC-only version of OpenBSC.  Needs a real MSC!
  Classical BSC which requires MSC to operate.
 
 Package: osmocom-nitb
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore, libdbd-sqlite3, libdbi1
+Depends: ${shlibs:Depends}, ${misc:Depends} libdbd-sqlite3
 Description: GSM Network-in-a-Box, implements BSC, MSC, SMSC, HLR, VLR
  All the GSM network components bundled together.
 
 Package: osmocom-ipaccess-utils
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Command line utilities for ip.access nanoBTS
  Utilities specific for ip.access unit.
 
 Package: osmocom-bs11-utils
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Command line utilities for Siemens BS-11 BTS
  Utilities specific for BS-11 unit.
 
 Package: osmocom-sgsn
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore, libgtp0
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Osmocom Serving GPRS Support Node
  SGSN implementation.
 
 Package: osmocom-gbproxy
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Osmocom GPRS Gb Interface Proxy
  Proxy for Gb interface.
 
 Package: osmocom-bsc-nat
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Osmocom Base Station Controller Network Address Translation
  Network address translation for BSC.