pipe handling errors

[Nellis, Kenneth]

At the risk of annoying folks uninterested in this problem,
here is a simpler test case:

Cygwin64> date; seq 10000 | wc -l; date
Tue Jul 15 15:30:03 EDT 2014
10000
Tue Jul 15 15:31:03 EDT 2014
Cygwin64>

The output ("10000") occurs immediately and then the hang
for precisely one minute before the 2nd date.

As before:

Cygwin64> uname -srvmo
CYGWIN_NT-6.1 1.7.31s(0.273/5/3) 20140715 15:34:37 x86_64 Cygwin
Cygwin64>

--Ken Nellis