[vtkusers] Support for Windows XP and 32-bit PPC MAC OS

[Sujin Philip]

Hi,

I am working on vtkAtomicInt. Some of the features I need are not supported
on older platforms. I wanted to know if any users still use/care about the
following platforms: Windows XP or OS X for 32 bit PowerPC platform. We can
implement a fall back to use mutexes on these platforms but I am wondering
if it is worth the effort.

Thanks
Sujin
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