Protect fork() against dll- and exe-updates.

[Michael Haubenwallner]

On 04/05/2016 10:35 AM, Corinna Vinschen wrote:
>>> I'm still not overly excited about using the existence of the dir alone
>>> as marker to activate this feature, but that can be added later...
>>
>> I could think of some flag to set in setup.exe, but still where to store
>> the flag except for the existence of the directory. I'm not sure if the
>> registry should be used for everything...
> 
> No, not the registry.  The CYGWIN environment variable, perhaps.

We use 'env -i' to start some package management processes, which clobbers
the CYGWIN environment variable as well...

/haubi/