[Patch] Allow to disable root privileges with CYGWIN=noroot

[Christian Franke]

Corinna Vinschen wrote:
> Patch checked in.
>   

Thanks.

> Thanks for doing this.  Would you have fun to provide a tool for the
> net distro which uses this feature?
>
>   

A first try is attached.

cygdrop command ... -- Drop admin group and most privileges and run command.
cygdrop -b command ... -- same, but keep SeBackupPrivilege (~ R/O admin :-)

Christian

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