channels1: Add missing config.h include

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

src/channels1.c

@@ -22,6 +22,8 @@
  * MA 02111-1307, USA.
  */
 
+#include "config.h"
+
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>