Use octal-escaped UTF-8 characters instead of plain text

https://bugs.freedesktop.org/show_bug.cgi?id=50970

src/hb-private.hh

@@ -557,13 +557,20 @@ _hb_debug_msg_va (const char *what,
     fprintf (stderr, " %*s  ", (unsigned int) (2 * sizeof (void *)), "");
 
   if (indented) {
-    static const char bars[] = "││││││││││││││││││││││││││││││││││││││││";
-    fprintf (stderr, "%2d %s├%s",
+/* One may want to add ASCII version of these.  See:
+ * https://bugs.freedesktop.org/show_bug.cgi?id=50970 */
+#define VBAR	"\342\224\202"	/* U+2502 BOX DRAWINGS LIGHT VERTICAL */
+#define VRBAR	"\342\224\234"	/* U+251C BOX DRAWINGS LIGHT VERTICAL AND RIGHT */
+#define DLBAR	"\342\225\256"	/* U+256E BOX DRAWINGS LIGHT ARC DOWN AND LEFT */
+#define ULBAR	"\342\225\257"	/* U+256F BOX DRAWINGS LIGHT ARC UP AND LEFT */
+#define LBAR	"\342\225\264"	/* U+2574 BOX DRAWINGS LIGHT LEFT */
+    static const char bars[] = VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR;
+    fprintf (stderr, "%2d %s" VRBAR "%s",
 	     level,
-	     bars + sizeof (bars) - 1 - MIN ((unsigned int) sizeof (bars), 3 * level),
-	     level_dir ? (level_dir > 0 ? "╮" : "╯") : "╴");
+	     bars + sizeof (bars) - 1 - MIN ((unsigned int) sizeof (bars), (unsigned int) (sizeof (VBAR) - 1) * level),
+	     level_dir ? (level_dir > 0 ? DLBAR : ULBAR) : LBAR);
   } else
-    fprintf (stderr, "   ├╴");
+    fprintf (stderr, "   " VRBAR LBAR);
 
   if (func) {
     /* If there's a class name, just write that. */