bug1399100-temporary.patch :
  This is a temporary patch as described in
    https://bugzilla.mozilla.org/show_bug.cgi?id=1399100
  It is temporarily necessary because of the changes in
    https://bugzilla.mozilla.org/show_bug.cgi?id=1384633
  The patch should be re-applied during the Firefox 57 release cycle,
  if other changes to NSPR are necessary during the lifetime of Firefox 57.
  The temporary API will be removed for Firefox 58, as agreed in
    https://bugzilla.mozilla.org/show_bug.cgi?id=1394808