Add compat bits to utf8.c.
diff --git a/utf8.c b/utf8.c
index 18ee538..6445b37 100644
--- a/utf8.c
+++ b/utf8.c
@@ -20,6 +20,8 @@
* in particular to sanitize untrusted strings for terminal output.
*/
+#include "includes.h"
+
#include <sys/types.h>
#include <langinfo.h>
#include <limits.h>
@@ -27,7 +29,9 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <vis.h>
+#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
+# include <vis.h>
+#endif
#include <wchar.h>
#include "utf8.h"