bug#7862: Cygwin test failure of parallel-am.test

[Ralf Wildenhues]

On Cygwin, parallel-am.test fails with a segmentation fault in an
automake invocation in the last loop of the test, here's the stackdump:

Exception: STATUS_ACCESS_VIOLATION at eip=610F2804
eax=0000FFD8 ebx=118E6800 ecx=118E9800 edx=118E67E0 esi=118DE828 edi=00009028
ebp=118E67D8 esp=027BC330 program=C:\cygwin\bin\perl.exe, pid 212, thread 
unknown (0xDDC)
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame     Function  Args
118E67D8  610F2804  (00000000, 00000000, 00000000, 00000000)
End of stack trace

The 'stderr' file contains the two 'installing ...install-sh' and
'missing' lines, but not the rest.  I haven't been able to reproduce the
bug by repeatedly rerunning automake with AUTOMAKE_JOBS set to 5.

Seems like I have a Cygwin bug to report ...

Cheers,
Ralf