- Remove extra include_module line - dunno how that got there.

- Remove extra include_module line - dunno how that got there.
- make lazy_eval_sentinel a const
- create #define for &lazy_eval_sentinel (LAZY_VALUE)
- create get_include_var function (get, check, get real value if lazy)
- cleanup the printenv call to be a bit more streamlined (can't use
  get_include_var here since it is iterating through the table here -
  well, you could do that, but I won't...)

Submitted by:	Greg Stein (concept)
Reviewed by:	Justin Erenkrantz

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90873 13f79535-47bb-0310-9956-ffa450edef68