Tweak rotatelogs -p such that the program is invoked the first time a

new log file is opened as well as for rotations:

* support/rotatelogs.c (usage): Update.
  (post_rotate): Omit third arg if no prev logfile known.
  (doRotate): Invoke even if no previous logfile was open.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1140099 13f79535-47bb-0310-9956-ffa450edef68