debian: Increase required libosmo-legacy-mgcp-dev version

Use the same version requirement as in configure.ac.

Change-Id: I2dc21e89bd676a754bc24a6995c4f9c0c4727d57
diff --git a/debian/control b/debian/control
index 4192f7b..963d664 100644
--- a/debian/control
+++ b/debian/control
@@ -17,7 +17,7 @@
                libosmo-sigtran-dev (>= 0.8.0),
                libosmo-abis-dev (>= 0.3.2),
                libosmo-netif-dev (>= 0.1.0),
-               libosmo-legacy-mgcp-dev (>= 0.0.1),
+               libosmo-legacy-mgcp-dev (>= 1.0.0),
                libosmo-mgcp-client-dev (>= 1.0.0)
 Standards-Version: 3.9.8
 Vcs-Git: git://git.osmocom.org/osmo-bsc.git