Correct printf arguments and use asprintf

Origin: http://marc.info/?l=openbsd-ports&m=142090828929750&w=2

* Str.c: Use asprintf() instead of rolling our own printf string
length detection.

* cookie.c: Pass the char pointer in the string struct to printf %s
instead of the string struct itself.
Print time_t using %lld instead of %ld to allow for 64-bit time_t.

* main.c: Print a long int using the correct format specifier.

* map.c: Print size_t using the correct format specifier.

map.c

@@ -573,7 +573,7 @@ page_info_panel(Buffer *buf)
 		   "<tr valign=top><td nowrap>Number of lines<td>",
 		   Sprintf("%d", all)->ptr,
 		   "<tr valign=top><td nowrap>Transferred bytes<td>",
-		   Sprintf("%d", buf->trbyte)->ptr, NULL);
+		   Sprintf("%zu", buf->trbyte)->ptr, NULL);
 
     a = retrieveCurrentAnchor(buf);
     if (a != NULL) {