[winex11.drv] XDND file drag support

[Damjan Jovanovic]

If wine is supposed to support XDND then it is currently badly broken:
it calls GetLongPathNameA on a UNIX path which always fails, it
doesn't URL decode the filename which means spaces get turned into
%20's, it doesn't use the text/uri-list MIME type like the X file drag
spec says, it only parses the first filename, and there is multiple
incompatible assumptions about how X11DRV_XDND_UnixToDos works. This
patch adds proper support for the X file drag protocol using
text/uri-list and has the workarounds needed to get file drops from
nautilus, thunar and konqueror.

Changelog:
* Added better support for the X file drag protocol.

Damjan Jovanovic
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