added IPP optimization of separable 32f filters; fixed IPP version check in DFT; fixed conditions in IPP optimization of norm functions.

initialization time.

This also fixes few clang build errors

Fixed flann build with NEON;
Fixed Haming distance with NEON;
Honest cvRound for WinRT added;
cvRound test added;
Video IO with direct show disabled;

Optimization introduced in b782d8bb only works for 64-bit builds, but
ifdef failed to check for this.