COMP: Remove MultiThreaderBase pixelCount
COMP: Remove MultiThreaderBase pixelCount

To address:

  /ITK/Modules/Core/Common/src/itkMultiThreaderBase.cxx:538:17: warning:
  variable 'pixelCount' set but not used [-Wunused-but-set-variable]
    SizeValueType pixelCount = 1;

vfonov/ITK,LucasGandel/ITK,BRAINSia/ITK,thewtex/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,vfonov/ITK,richardbeare/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,hjmjohnson/ITK,richardbeare/ITK,hjmjohnson/ITK,LucasGandel/ITK,LucasGandel/ITK,hjmjohnson/ITK,Kitware/ITK,vfonov/ITK,thewtex/ITK,richardbeare/ITK,BRAINSia/ITK,hjmjohnson/ITK,vfonov/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,vfonov/ITK,richardbeare/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,thewtex/ITK,richardbeare/ITK,BRAINSia/ITK,LucasGandel/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,vfonov/ITK,Kitware/ITK,vfonov/ITK,thewtex/ITK,LucasGandel/ITK,thewtex/ITK,thewtex/ITK,BRAINSia/ITK,vfonov/ITK,BRAINSia/ITK,BRAINSia/ITK,LucasGandel/ITK,Kitware/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK