support SLT_F_UNSAFE

Ref varnish-cache master 2d0843eac8d77cfb3369591a61234d9c3ed6881e

Introduced

src/format.c

@@ -797,15 +797,12 @@ format_VCL_Log(const tx_t *tx, const arg_t *args, char **s, size_t *len)
     *len = strlen(l);
 }
 
-/*
- * XXX: apparently none of VSL, varnishlog or varnishncsa use VSB_quote
- * for SLT_F_BINARY any more.
- */
 void
 format_SLT(const tx_t *tx, const arg_t *args, char **s, size_t *len)
 {
     format_slt(tx, args->tag, args->hdr_idx, args->fld, s, len);
-    if (VSL_tagflags[args->tag] & SLT_F_BINARY && *s != NULL && *len > 0)
+    if (VSL_tagflags[args->tag] & (SLT_F_UNSAFE|SLT_F_BINARY) &&
+        *s != NULL && *len > 0)
         for (int i = 0; i < *len; i++)
             if (!isprint(*(*s + i))) {
                 VSB_clear(scratch);