COMP: enables TBB 4.4 back-end for VTK7's SMP
COMP: enables TBB 4.4 back-end for VTK7's SMP

Avoids #error TBB is unable to run on old Windows versions; _WIN32_WINNT must be 0x0501 or greater.

Change-Id: I239b2262bd231a7ac867085b5c329281d35e9ed4

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