[vtkusers] Removing support for VS 8 and GCC < 4.1

[Utkarsh Ayachit]

>
> I would go so far as to say it's reasonable that the dev/trunk/master
> branch of a project should only support the two most recent stable
> compiler releases on any given platform. Even less for
> dev/trunk/master if there is compelling reason to use a feature only
> available in the most recent stable release.
>

+1. At the very least, we should drop OSes and compilers that the
OS/compiler provides themselves no longer support e.g. XP, Snow Leopard,
etc.

Utkarsh
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