...similar to df9edbcd 'Work around 'xargs:
environment is too large for exec' errors on Windows"

Change-Id: I50bc5c73b84e2d8e7adc70f72f9af2d23a0b3b36
Reviewed-on: https://gerrit.libreoffice.org/60241
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>