Put brackets around mblen() compat constant.
This might help with the reported problem cross compiling for Android
("error: expected identifier or '(' before numeric constant") but
shouldn't hurt in any case.
diff --git a/openbsd-compat/openbsd-compat.h b/openbsd-compat/openbsd-compat.h
index 1cffefe..cb59ccd 100644
--- a/openbsd-compat/openbsd-compat.h
+++ b/openbsd-compat/openbsd-compat.h
@@ -221,7 +221,7 @@
/* multibyte character support */
#ifndef HAVE_MBLEN
-# define mblen(x, y) 1
+# define mblen(x, y) (1)
#endif
#if !defined(HAVE_VASPRINTF) || !defined(HAVE_VSNPRINTF)