patch for OCC 6.8 from Thierry Thomas


git-svn-id: https://geuz.org/svn/gmsh/trunk@19972 59c8cabf-10d6-4a28-b43f-3936b85956c4
pp


git-svn-id: https://geuz.org/svn/gmsh/trunk@19973 59c8cabf-10d6-4a28-b43f-3936b85956c4