Include config.h as a system include, as recommended by the autoconf documentation.

libmisc/xgetXXbyYY.c

@@ -23,7 +23,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include "config.h"
+#include <config.h>
 #include "prototypes.h"
 
 #define XFUNCTION_NAME XPREFIX (FUNCTION_NAME)

libmisc/yesno.c

@@ -33,7 +33,7 @@
  * Used by pwck.c and grpck.c
  */
 
-#include "config.h"
+#include <config.h>
 
 #ident "$Id$"