Wrap `vtkRenderingMatplotlib` for object factory.

Without wrapping turned on, ParaView (and any other
applications that access MathText classes via wrappers)
will not properly include the compiler definitions that
register the `matplotlib` overrides with `vtkObjectFactory`.
For this reason, we must not exclude the library from
wrapping and also provide one class for wrapping.

Change-Id: I3ad084ce9008f63dec4ffe7d20ffc440dae6d49d

Rendering/Matplotlib/CMakeLists.txt

@@ -17,7 +17,6 @@ set(Module_SRCS
 
 set_source_files_properties(
   ${vtk-module}ObjectFactory
-  vtkMatplotlibMathTextUtilities
   WRAP_EXCLUDE
   )
 

Rendering/Matplotlib/module.cmake

@@ -14,5 +14,4 @@ vtk_module(vtkRenderingMatplotlib
     vtkRenderingOpenGL
     vtkRenderingFreeTypeOpenGL
     vtkViewsContext2D
-  EXCLUDE_FROM_WRAPPING
   )