Move some critical OS code from mod_isapi into the Win32 platform dso
  support.  1) made isapi simpler, 2) made dso more robust, and...

  I have observed odd GP faults when using LoadLibrary[Ex] with forward
  slashes, and MS warns in several places that it must use backslashes
  in this context.  Well... we are seeing some odd gp faults at shutdown
  with mod_perl.  So perhaps, maybe, this makes them go away.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@86443 13f79535-47bb-0310-9956-ffa450edef68