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

[Helmut Karlowski]

Hello,

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.

It also sets SHELL if not yet set and avoids a call of hostname.


Maybe the maintainer takes a look.

-Helmut
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