The font width used to mean the average character width on Windows,
like GDI’s LOGFONT lfWidth. This complicates things cross-platform, and
also DirectWrite does not expose such info.
Drop the whole average character width nonsense and align Windows to
other platforms, keeping the already existing cross-platforms
workarounds for EMF/WMF that are now applied also to Windows.
Change-Id: I750d42ad090bb9d0f776e80609b7a67b8ac38aac
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/207990
Reviewed-by: Khaled Hosny <khaled@libreoffice.org>
Tested-by: Jenkins