COMP: TIFFImageIO: use types defined in itkIntTypes.h.

Intended to address:

/scratch/dashboards/Linux-x86_64-gcc4.4-system/ITK/Modules/IO/TIFF/src/itkTIFFImageIO.cxx:
In member function 'void itk::TIFFImageIO::InternalWrite(const void*)':
/scratch/dashboards/Linux-x86_64-gcc4.4-system/ITK/Modules/IO/TIFF/src/itkTIFFImageIO.cxx:1910:
error: 'uint64' was not declared in this scope

Change-Id: I6215d11de168a394f222b723c48f88ad66398d60
Merge topic 'tiff-int'

783d733 COMP: TIFFImageIO: use types defined in itkIntTypes.h.