[PATCH 1/2 rebase] Remove duplicates from file list

[Yaakov (Cygwin/X)]

This is required as DLLs in some of these directories may have indeed
been installed with setup.exe as part of a package (e.g. Python doesn't
have separate vendor and site directories).  It is also possible that a
file added on the command-line is already listed, wasting valuable
rebase space.


Yaakov
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