Update gfxGLShader.h

forgot to save the file...

Engine/source/gfx/gl/gfxGLShader.h

@@ -93,6 +93,7 @@ protected:
    /// @{
    GLuint mVertexShader;
    GLuint mPixelShader;
+   GLuint mGeometryShader;
    GLuint mProgram;
    /// @}