use the new path checking syntax

git-svn-id: https://geuz.org/svn/gmsh/trunk@20182 59c8cabf-10d6-4a28-b43f-3936b85956c4
use the new path checking syntax

git-svn-id: https://geuz.org/svn/gmsh/trunk@20183 59c8cabf-10d6-4a28-b43f-3936b85956c4