Revert "Add an MMX fwht4x4"

Includes changes that are not compatible with VS windows builds.
Amongst other things stdint.h is not supported in VS.

This reverts commit 89fbf3de501b5d7fd90047192521eae3198705cd.

Change-Id: Ifa86d7df250578d1ada9b539c9ff12ed0c523cdd
4 files changed