[PUSHED] use MD5SUM env variable adn not md5sum directly

[Norbert Thiebaud (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/3805

Approvals:
  Norbert Thiebaud: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I985b3373edcd0bfc151adfa92b79a6b5080d22ad
Gerrit-PatchSet: 2
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Norbert Thiebaud <nthiebaud at gmail.com>
Gerrit-Reviewer: Norbert Thiebaud <nthiebaud at gmail.com>