Let patch build on Cygwin on Windows 7

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/13844">trac #13844</a>.

Spkg diff, for review only.

Reported by: jpflori

Component: cygwin

CC: kcrisman,, dimpase

Report Upstream: N/A

Authors: Jean-Pierre Flori

Dependencies: 

Work issues: 

Reviewers: Dmitrii Pasechnik

Merged in: sage-5.7.beta2

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13844/patch-2.5.9.p3.diff">patch-2.5.9.p3.diff: Spkg diff, for review only.</a> by jpflori at 20130113T13:29:50</li></ol>