Fix the rewrite_map program invocation for Win32. Someone borrowed

  Fix the rewrite_map program invocation for Win32.  Someone borrowed
  the pass-environ[][] construct from unix, but CreateProcess is much
  happier to copy the current environment when passed NULL for the
  flat environment strings argument (properly formatted, that argument
  must be null or a string in the format "var1=val\0var2=val\0\0".)

  The only other CreateProcess call which does *not* pass NULL for
  the envvars arg, in util_script.c for cgi, does the right thing
  in constructing that argument.

Submitted by: Philip Gladstone [pgladstone cisco.com]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@104005 13f79535-47bb-0310-9956-ffa450edef68