Merge topic 'minor_gl_version_bug'

aae92bb6 super small bug in opengl version query
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1270

Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx

@@ -578,7 +578,7 @@ void vtkOpenGLRenderWindow::GetOpenGLVersion(int &major, int &minor)
 #endif
     }
 
-  major = glMinorVersion;
+  major = glMajorVersion;
   minor = glMinorVersion;
 }