Undid change committed in r19612 that was erroneous

git-svn-id: https://geuz.org/svn/gmsh/trunk@19613 59c8cabf-10d6-4a28-b43f-3936b85956c4
git-svn-id: https://geuz.org/svn/gmsh/trunk@19614 59c8cabf-10d6-4a28-b43f-3936b85956c4
git-svn-id: https://geuz.org/svn/gmsh/trunk@19615 59c8cabf-10d6-4a28-b43f-3936b85956c4
git-svn-id: https://geuz.org/svn/gmsh/trunk@19616 59c8cabf-10d6-4a28-b43f-3936b85956c4