Correct a build error that got past my build test somehow.

lib/libutil/auth.c

@@ -34,6 +34,7 @@
 
 #include <stdio.h>
 #include <syslog.h>
+#include <sys/types.h>
 #include <libutil.h>
 
 static properties P;

lib/libutil/property.c

@@ -31,8 +31,10 @@
  */
 
 #include <ctype.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 #include <libutil.h>
 
 #define MAX_NAME	64