Microsoft Windows imposes strict filename restrictions on its platform.
As RDP is developed by Microsoft and the RDS in MS Windows is typically
used as remote desktop server for the RDP protocol, these filename
restrictions are also enforced in WinPR, when copy-pasting files over
the clipboard.
However, in some connections no peer on MS Windows is involved and in
these situations, these filename restrictions are just an annoyance.
With a recent API addition in WinPR, it is now possible to override the
callback, where the filename is checked, whether it is valid.
So, use this new API to relieve the filename restriction, when the
connected remote desktop server is not on MS Windows.
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