since commit 6b448d36
   "make __RSC a builtin define for the RSC compiler"

Change-Id: I99af239993c3217bf528f5595def0c2de337f01b
Reviewed-on: https://gerrit.libreoffice.org/37025Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>