For Offimisc Writer template
zip mimetype file with -0 option
--filesync option must be removed as it remove mimetype
remove unused test of exiting files
restore script extras_Tploffimisc_make_file_deps

Change-Id: I7851635f483d10bcf179b568250be31d763d60b9
Reviewed-on: https://gerrit.libreoffice.org/71473
Tested-by: Jenkins
Reviewed-by: Laurent BP <laurent.balland-poirier@laposte.net>