Improve ability to compile on C90 Compilers.

* Move all variable declartions to the top of their blocks.
* Remove traiing comma on enum
* Only use C90 style comments.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@708813 13f79535-47bb-0310-9956-ffa450edef68