don't add invalid UTF-8 to _NET_WM_NAME and _NET_WM_ICON_NAME
don't add invalid UTF-8 to _NET_WM_NAME and _NET_WM_ICON_NAME

time to get rid of workarounds for broken window managers that were
introduced more than 10 years ago.

Change-Id: I43b4c7aeab1b86b3d4a290a1d1d64c6fcb9a57ef
Reviewed-on: https://gerrit.libreoffice.org/633
Reviewed-by: Miklos Vajna <16f13092e03e3d9e997de904d0f86cc803fb6ef7@suse.cz>
Tested-by: Miklos Vajna <16f13092e03e3d9e997de904d0f86cc803fb6ef7@suse.cz>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core