mgw: Don't be case-sensitive when parsing X-Osmo-IGN param

Some implementations like our TTCN3 encoder set all param characters in
caps.

Related: SYS#5063
Change-Id: Ie4bc5e86551c55021ca6ca2fbc6fc56a26f5fb16
diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index 4c00140..97c6d3f 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -707,7 +707,7 @@
 {
 	char *saveptr = NULL;
 
-	if (strncmp(line, MGCP_X_OSMO_IGN_HEADER, strlen(MGCP_X_OSMO_IGN_HEADER)))
+	if (strncasecmp(line, MGCP_X_OSMO_IGN_HEADER, strlen(MGCP_X_OSMO_IGN_HEADER)))
 		return false;
 	line += strlen(MGCP_X_OSMO_IGN_HEADER);