Accept hex headers terminated with 0x8A

Some ZMODEM implementations set the high bit (even parity?) when sending this '\n' terminator.
As reported via IRC:
<Keyop> sexyz: !zmodem_recv_hex_header HEX header not terminated with LF: 138 (8Ah)

src/sbbs3/zmodem.c

@@ -1166,7 +1166,7 @@ BOOL zmodem_recv_hex_header(zmodem_t* zm)
 		 */
 		c = zmodem_rx(zm);	/* drop LF */
 	}
-	if(c != '\n') {
+	if(c != '\n' && c != 0x8A) {
 		lprintf(zm, LOG_ERR, "%s HEX header not terminated with LF: %s"
 			,__FUNCTION__, chr(c));
 		return FALSE;