'NSNoUnderlineStyle' & ‘NSSingleUnderlineStyle’: Deprecated in OS X 10.9

Change-Id: Id25d27f77c43c5fa11ff03aa38edcaec762caf61
Reviewed-on: https://gerrit.libreoffice.org/9739
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>