Fix "symbol aliasing" code

(cherry picked from commit 434c5d7845ab25f8a518e7bec910f8628725d5b9)
Conflicts:
	vcl/source/gdi/impfont.cxx

Change-Id: Ic4605c40b9f3467f84732a0e3c956976fae68277
Reviewed-on: https://gerrit.libreoffice.org/9285
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>