- Reference strings are not part of the symbolic link. Therefore don't include them...

- Reference strings are not part of the symbolic link. Therefore don't include them when creating the symbolic link (IoCreateSymbolicLink)
- Reference strings are used by the kernel streaming system to distinguish kernel streaming filters. As it is perfectly possible, to provide more than one filter with same guid but different reference string, ignore the failure for now if IoCreateSymbolicLink fails

See issue #4566 for more details.

svn path=/trunk/; revision=42819