Easy votes: sync 2.4 and trunk

  - Avoid some memory allocation and work when TRACE1 is not activated
  - fix typo in include guard
  - indent
  - No need to lower the string before removing the path, it is just a waste of time...
  - Save a few cycles

trunk patch: http://svn.apache.org/r1451478
             http://svn.apache.org/r1514215
             http://svn.apache.org/r1452195
             http://svn.apache.org/r1517025
             http://svn.apache.org/r1517045

Submitted by: jailletc36
Reviewed by: jim, minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1523248 13f79535-47bb-0310-9956-ffa450edef68