- when using "-l" reduce two consecutive calls to apr_time_now() to one.

- when using "-l" reduce two consecutive calls to apr_time_now() to one.
  This will not change the logic if no "-l" gets used, and it will spare
  one call to apr_time_now() in case "-l" gets used and more important
  it gives the code better atomicity, because in fact between the two calls
  there is a slight change of jumping oder the DST boundary

- for historic reasons the same code block is used two times with a
  slightly different way of transforming apr_time_t to int
  (once division by APR_USEC_PER_SEC, once call to apr_time_sec()),
  so let's unify it.

- finally move the block into a function, because it gets used already
  two times.

PR: 44004
Submitted by: Rainer Jung <rainer.jung kippdata.de>
Reviewed by: rpluem

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@600154 13f79535-47bb-0310-9956-ffa450edef68