Resolves: #i124085# improved support for PNG clipboard format on windows

(cherry picked from commit 3bd259ce52b15e968302ecca39f72d06af66e301)

Change-Id: Ie9b677d8948912b372a13353cd82a2f5e2f1cf49
Reviewed-on: https://gerrit.libreoffice.org/8785
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>