Windows: Do not redistribute the policy assembly

Policy assemblies must not be distributed by third parties.

Change-Id: I431efc5aeac593bbbf6358e89a07c4928390e7d4
Windows: $(SDKREDISTDIR)\heimdal-version.mak

Create a heimdal-version.mak include file which can be included
in third party installer makefiles to determine which compiler and run
time library type was used to build the merge modules.  It is the
responsibility of third party installer packages to include the Visual
Studio CRT merge modules that are required for execution.

Change-Id: Icec2f47755ef7cc5f7dde2e0426603dece7e4933