Environment variables can contain >127 characters

Change-Id: Iaeb690429d835ab2e6c13a8890a1b27b9405796a
Reviewed-on: https://gerrit.libreoffice.org/7476
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>