Add some indirection to the quantize test

Visual Studio and XCode require the address of the functions be passed.

Change-Id: Id39cab8e50061fdc6ac6018371a3a158c713e14b
Align structures in quantize test

MACROBLOCKD structures require alignment.

This fixes an issue caught by clang IOC.

Change-Id: Ibb5bcc122f531b4302a87e1144e4feaf46c1de64