sanitize.opts: add osmo-sip-connector --enable-sanitize

Otherwise it is not able to link asan-enabled libosmocore in the binaries.

Change-Id: I5e04ef38982ee6c89110776fc941ee0e2c193196
diff --git a/sanitize.opts b/sanitize.opts
index 40675be..7d545d2 100644
--- a/sanitize.opts
+++ b/sanitize.opts
@@ -12,3 +12,4 @@
 osmo-msc --enable-sanitize
 osmo-sgsn --enable-sanitize
 openbsc --enable-sanitize
+osmo-sip-connector --enable-sanitize