/etc/profile: avoid multiple /usr/bin in PATH

[Achim Gratz]

Helmut Karlowski writes:
> I set C:/cygwin/usr/bin in my windows-environment. Now /etc/profile
> always adds /usr/bin to PATH resulting in /usr/bin being twice in my
> cygwin-PATH.
>
> The attached patch fixes this.

I've added the option to just use the already set-up PATH variable from
Windows for this use case.  Set CYGWIN_USEWINPATH before starting up.


Regards,
Achim.
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