make including config.h always depend on HAVE_CONFIG_H; replace printf() by debug()

shared/configfile.c

@@ -13,13 +13,15 @@
  *
  */
 
-#include "config.h"
-
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <stdlib.h>
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include "shared/report.h"