Windows: Build shim binary from Microsoft/hcsshim
Windows: Build shim binary from Microsoft/hcsshim

Signed-off-by: John Howard <jhoward@microsoft.com>

This is part of a phased update to remove the existing Windows shim
code from the containerd repo, and instead use the one from Microsoft/hcsshim.

vdemeester/containerd,vdemeester/containerd,containerd/containerd,crosbymichael/containerd,mikebrow/containerd,estesp/containerd,estesp/containerd,thaJeztah/containerd,dmcgowan/containerd,crosbymichael/containerd,containerd/containerd,mikebrow/containerd,dmcgowan/containerd,thaJeztah/containerd