[PUSHED] Fix bashism in configure.ac

[Fridrich Strba (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/2978

Approvals:
  Fridrich Strba: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I574e873fede3343b2384715162dcecce86563db3
Gerrit-PatchSet: 3
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Mathias M <matm at gmx.fr>
Gerrit-Reviewer: Fridrich Strba <fridrich at documentfoundation.org>