unixfs: Fix ParseDisplayName

[Michael Jung]

The call to SHBindToParent in UnixFolders' ParseDisplayName only succeeded by 
incidence thus far. Our DesktopFolder implementation calls ParseDisplayName 
always with a single subdirectory, which leads to a simple pidl. 
SHBindToParent accordingly binds to an empty pidl, which corresponds to the 
desktop. The Desktop's GetAttributesOf then calls SHELL32_GetItemAttributes, 
which gets the Attributes directly from the pidl. Thus, we got the correct 
result, although the pidl passed to SHBindToParent was only a relative one, 
while it should be absolute. It breaks, if we root unixfs beneath MyComputer, 
which behaves differently than the Desktop folder.

Changelog:
	Build an absolute pidl to query attributes in UnixFolder::ParseDisplayName 

Bye,
-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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