When sending an SMS with a user data header properly set the UDH flag in the first byte. (issue #8347 reported by hoffmeis)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@47549 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_sms.c

@@ -1050,7 +1050,7 @@ static void sms_nextoutgoing (sms_t * h)
 		unsigned char p = 2;
 		h->omsg[0] = 0x91;		  /* SMS_DATA */
 		if (h->smsc) {			 /* deliver */
-			h->omsg[p++] = (more ? 4 : 0);
+			h->omsg[p++] = (more ? 4 : 0) + ((h->udhl > 0) ? 0x40 : 0);
 			p += packaddress (h->omsg + p, h->oa);
 			h->omsg[p++] = h->pid;
 			h->omsg[p++] = h->dcs;