debian/control: add missing libdbd-sqlite3 to Build-Depends

The libdbd-sqlite3 provides SQLite3 driver for libdbi. We use it
by default for the built-in SMS Centre. Since [1], we have unit
test coverage for the db_sms_* API, thus we need libdbd-sqlite3
to be installed at build-time.

[1] Id94ad35b6f78f839137db2e17010fbf9b40111a3

Change-Id: Ice9fb11f5b8a39abecee426d2fadcf62b7ee47c4
diff --git a/debian/control b/debian/control
index 8b0d690..887e386 100644
--- a/debian/control
+++ b/debian/control
@@ -10,6 +10,7 @@
                libtool,
                pkg-config,
                libdbi-dev,
+               libdbd-sqlite3,
                libsctp-dev,
                libtalloc-dev,
                libsmpp34-dev (>= 1.12),