remove useless things in GradientBasisx


git-svn-id: https://geuz.org/svn/gmsh/trunk@17954 59c8cabf-10d6-4a28-b43f-3936b85956c4
fix compilex


git-svn-id: https://geuz.org/svn/gmsh/trunk@17955 59c8cabf-10d6-4a28-b43f-3936b85956c4