blind fix for MacOS build

description of problem here:
https://lists.freedesktop.org/archives/libreoffice/2017-July/078168.html

There is no need for a explicit delete of operator!= .
C++ doesn't generate comparison operators for objects even if one
kind is defined (here operator==).

Change-Id: Ifb22b3f9baa5ca23a4b64800d601cec66dcf39e0
Reviewed-on: https://gerrit.libreoffice.org/40566
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
diff --git a/include/drawinglayer/primitive2d/borderlineprimitive2d.hxx b/include/drawinglayer/primitive2d/borderlineprimitive2d.hxx
index a174dcb9d..2491619 100644
--- a/include/drawinglayer/primitive2d/borderlineprimitive2d.hxx
+++ b/include/drawinglayer/primitive2d/borderlineprimitive2d.hxx
@@ -49,9 +49,6 @@ namespace drawinglayer
            double              mfExtendStart;
            double              mfExtendEnd;

            // not implemented
            virtual bool operator!=(const BorderLine& rBorderLine) const = delete;

        public:
            BorderLine(
                double fWidth,