Minor rotatelogs changes:

- remove 'now' from status struct. We only need it locally.
- add 'static' to function declaration, although the code
  is still in a single file
- change signature of get_now()
- make argument count check easier to understand


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@733513 13f79535-47bb-0310-9956-ffa450edef68