fdo#60689: replace SUPD variable

Change-Id: Iad63330f8762b595ba5ee94fc20bc2c64ac92f6b
Reviewed-on: https://gerrit.libreoffice.org/11937
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>