osl/unx: Remove ifdefery for ancient NetBSD < 3.0
osl/unx: Remove ifdefery for ancient NetBSD < 3.0

Change-Id: I808da98a3b825eb2213dbcb6d435baa58bf54a9d
Reviewed-on: https://gerrit.libreoffice.org/12151
Reviewed-by: Bryan Quigley <e3213d2ab8582d83a37121688746a5a0d65fc334@gmail.com>
Reviewed-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>
Tested-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core