Remove Old C-Language VixDiskLib Binding Code

The VixDiskLib C-Language Binding has been out of use for some months now.  The
binding is no longer built as part of the build process.  This PR will simply
remove the unused code from the tree.
Merge pull request #851 from jerryk55/remove_vixdisklib_raw

Remove Old C-Language VixDiskLib Binding Code