env is in /usr/bin, not in /bin

Change-Id: I9cfd84b2bd5a2381d517cde9d851f6c7250f8d91
Reviewed-on: https://gerrit.libreoffice.org/13563
Reviewed-by: Arnaud Versini <arnaud.versini@libreoffice.org>
Tested-by: Arnaud Versini <arnaud.versini@libreoffice.org>