Merge topic 'fix_gles_ios'

846bc760 Fix GLES regression on IOS devices

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ken Martin <ken.martin@kitware.com>
Merge-request: !5253

Rendering/OpenGL2/vtkOpenGLError.h.in

@@ -80,7 +80,7 @@ const char *vtkOpenGLStrError(unsigned int code)
       return "Invalid operation";
     case GL_OUT_OF_MEMORY:
       return "Out of memory";
-#ifdef GL_ES_VERSION_3_0
+#ifndef GL_ES_VERSION_3_0
     case GL_STACK_OVERFLOW:
       return "Stack overflow";
     case GL_STACK_UNDERFLOW: