Changes

debian/control: remove build-dep: libosmo-sccp-dev

This follows the removal of the libsccp.a and the pkg-config
libosmo-sccp.pc from libosmo-sccp.git

Related: libosmo-sccp I299a32a2f8f61477cf49c8126567fef2092d5407
Change-Id: I2fc827cf15b7f78173e5ee489abe2c6d12b82c2f
(cherry picked from commit a39a564906f138d9cc7d2e7a3bd483921abeeab2)