Windows: Support building a lite-client installer

Windows: Support building a lite-client installer

If LITECLIENT is defined when invoking the WiX based MSI installer
build, we will build a light-weight client installer MSI.  This
minimizes the size of the installer for users who only need client
functionality from OpenAFS.

The light-weight client excludes:

  - Server components
  - Control center components
  - Administration utilities
  - Debug symbols

Lite-client installer can also be built by invoking target wix-lite
from the root NTMakefile.

Change-Id: I544cdb7170d17358eb235f3c476c468dbae62776
Reviewed-on: http://gerrit.openafs.org/2034
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>