Make sure ast uses vt_threaded=0 consistent with how sfio is built

diff --git a/lib/ast/strton.c b/lib/ast/strton.c
index 4d52768124cee2a57b9adb6e160f649d22ecf21f..9fb311159695ecb81f0f0a6d0bbc2ae4f381042c 100644 (file)
--- a/lib/ast/strton.c
+++ b/lib/ast/strton.c
@@ -56,6 +56,9 @@
 
 #include <ctype.h>
 
+/* For graphviz, only unthreaded */
+#define vt_threaded 0
+
 #include "sfhdr.h"
 
 #define QL             01