vcard_test_encode.c: #include <config.h> (for _unused)

Author: ksmurchison

Diff for: src/test/libicalvcard/vcard_test_encode.c

@@ -9,6 +9,10 @@
 
  ======================================================================*/
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include "vcard.h"
 
 #include <assert.h>