cygcheck -s segfaults in cygwin64 on Win7Pro-64

[Andrew Schulman]

> Instead, I found that COMSPEC needs to be set in the environment or I get a 
> segfault as shown in my previous email below.  I don't know why that is, 
> but I can easily demonstrate it.

Confirmed here.  I had actually already seen this segfault too, but I
hadn't figured out it was caused by empty COMSPEC.


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