Merge r757376 from trunk:

Prevent a case of SSI timefmt-smashing with filter chains including
multiple INCLUDES filters:

* modules/filters/mod_include.c (add_include_vars): Drop unused
  timefmt argument.
  (add_include_vars_lazy): Take timefmt argument.
  (get_include_var, handle_printenv): Pass time format from context.

PR: 39369

Submitted by: jorton
Reviewed by: rpluem, jim, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@773352 13f79535-47bb-0310-9956-ffa450edef68