Fix: drop nolopts attribute from *mailx-** variables..

Fix: drop nolopts attribute from *mailx-** variables..

Ooops, [10028c16f] (Prepare variable handling for future bit
extension etc.) added the a_AMV_VF_NOLOPTS protection bit to

  ${mailx-command}${mailx-subject}
  ${mailx-from}${mailx-sender}
  ${mailx-to}${mailx-cc}${mailx-bcc}
  ${mailx-raw-to}${mailx-raw-cc}${mailx-raw-bcc}
  ${mailx-orig-from}${mailx-orig-to}${mailx-orig-gcc}${mailx-orig-bcc}

so that these were not covered by `localopts' no more.
Remove that bit again, and cover the problem with a test.