vlr.h: remove unused ran_conn out of the header

The ran_conn isn't used at all by the VLR

Change-Id: I247d636d835c09f7a7b66dee52eb8608aa358815
diff --git a/src/libmsc/msub.c b/src/libmsc/msub.c
index ac93665..8df8d26 100644
--- a/src/libmsc/msub.c
+++ b/src/libmsc/msub.c
@@ -28,6 +28,7 @@
 #include <osmocom/msc/msc_a.h>
 #include <osmocom/msc/msc_i.h>
 #include <osmocom/msc/msc_t.h>
+#include <osmocom/msc/ran_conn.h>
 #include <osmocom/msc/vlr.h>
 #include <osmocom/msc/e_link.h>