vtkMPIOutputWindow: Remove unnecessary export modifier
vtkMPIOutputWindow: Remove unnecessary export modifier

The class vtkMPIOutputWindow had the VTK_PARALLEL_EXPORT modifier
but the declaration of the class is in the cxx and not used elsewhere.
The constructor was also updated to remove unecessary CreateInstance(...) and
delete. There seems to be no reason for this logic and in the case of
a registered overide will blow the stack.

Change-Id: I9af45d5de9a9c74347f1ffb2fa7822fed1c237d5

mspark93/VTK,mspark93/VTK,collects/VTK,candy7393/VTK,biddisco/VTK,sankhesh/VTK,cjh1/VTK,sumedhasingla/VTK,ashray/VTK-EVM,aashish24/VTK-old,berendkleinhaneveld/VTK,gram526/VTK,sankhesh/VTK,hendradarwin/VTK,msmolens/VTK,biddisco/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,jmerkow/VTK,msmolens/VTK,SimVascular/VTK,sankhesh/VTK,spthaolt/VTK,sumedhasingla/VTK,keithroe/vtkoptix,candy7393/VTK,biddisco/VTK,spthaolt/VTK,SimVascular/VTK,spthaolt/VTK,hendradarwin/VTK,johnkit/vtk-dev,hendradarwin/VTK,cjh1/VTK,spthaolt/VTK,biddisco/VTK,johnkit/vtk-dev,collects/VTK,jmerkow/VTK,collects/VTK,msmolens/VTK,berendkleinhaneveld/VTK,demarle/VTK,johnkit/vtk-dev,cjh1/VTK,candy7393/VTK,aashish24/VTK-old,SimVascular/VTK,keithroe/vtkoptix,aashish24/VTK-old,msmolens/VTK,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,ashray/VTK-EVM,jmerkow/VTK,jmerkow/VTK,gram526/VTK,demarle/VTK,SimVascular/VTK,biddisco/VTK,johnkit/vtk-dev,keithroe/vtkoptix,biddisco/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,SimVascular/VTK,jmerkow/VTK,collects/VTK,gram526/VTK,mspark93/VTK,berendkleinhaneveld/VTK,biddisco/VTK,demarle/VTK,sankhesh/VTK,demarle/VTK,demarle/VTK,gram526/VTK,keithroe/vtkoptix,mspark93/VTK,sumedhasingla/VTK,ashray/VTK-EVM,candy7393/VTK,ashray/VTK-EVM,sankhesh/VTK,spthaolt/VTK,sankhesh/VTK,hendradarwin/VTK,sumedhasingla/VTK,candy7393/VTK,jmerkow/VTK,mspark93/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,sumedhasingla/VTK,mspark93/VTK,ashray/VTK-EVM,aashish24/VTK-old,ashray/VTK-EVM,gram526/VTK,hendradarwin/VTK,sankhesh/VTK,sumedhasingla/VTK,cjh1/VTK,berendkleinhaneveld/VTK,mspark93/VTK,candy7393/VTK,collects/VTK,collects/VTK,sumedhasingla/VTK,SimVascular/VTK,aashish24/VTK-old,gram526/VTK,cjh1/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,demarle/VTK,candy7393/VTK,hendradarwin/VTK,ashray/VTK-EVM,msmolens/VTK,gram526/VTK,gram526/VTK,spthaolt/VTK,johnkit/vtk-dev,candy7393/VTK,msmolens/VTK,mspark93/VTK,cjh1/VTK,demarle/VTK,johnkit/vtk-dev,SimVascular/VTK,spthaolt/VTK,sankhesh/VTK,msmolens/VTK,msmolens/VTK,aashish24/VTK-old,hendradarwin/VTK,jmerkow/VTK,jmerkow/VTK