fdo#65836 bnc#621241 Do not compress WMF / EMF file incase of OOXML export

(cherry picked from commit 8fe352be80ff69552f622f3c7a6a6f269912ab71)

Change-Id: Ic498e5703ab48719f998be6da3f245843cc0979d
Reviewed-on: https://gerrit.libreoffice.org/11426
Reviewed-by: Nikhil Walvekar <nikhil.walvekar@synerzip.com>
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>