unixfs: Apply FILESYSANCESTOR and FILESYSTEM flags

[Michael Jung]

An IShellFolder that sets the FILESYSTEM flag in it's GetAttributesOf method 
tells the system that it has a corresponding dos path.

An IShellFolder that returns a FILESYSANCESTOR flag from it's GetAttributesOf 
method, tells the system that while itself might not be accessible by a dos 
path, on of it's childs is.

With this patch applied, users can only select files and folders that have a 
valid corresponding dos path. Tested with wine's own file dialogs, the 
SHBrowseForFolder dialog and MS Office 2000's file dialogs.

If you would like to test it, please register the namespace extension with the 
appended registry file. If you start with a clean .wine directory, Juan's 
recent patch will set the Desktop's path to Z:\home\julliard. The file 
dialogs won't work any more if you remove Z: afterwards. So you have to remap 
the Desktop path or use an old .wine directory. 

Changelog:
	Set the FILESYSANCESTOR and FILESYSTEM flags correctly in GetAttributesOf

Bye,
-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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REGEDIT4

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\Namespace\{9D20AAE8-0625-44B0-9CA7-71889C2254D9}]