[PATCH] get rid of windows C4146 warning in MathExtras.h

[Peng Cheng]

For 32bit, -Val is changed to ((uint32_t)(0x100000000-Value)).

For 64bit, -Val is changed to ((uint64_t)( UINT64_MAX - Value + 1 )).

Both new fixes are essentially the same as the underlying operations for
-Val.  So, there is no semantics change, and no extra computational cost.

See fix in the patch attached.
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