Resolve ecl.dll conflict on Cygwin

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/9167">trac #9167</a>.

Spkg diff, for review only.

Reported by: was

Component: cygwin

CC: mhansen,, dimpase,, jpflori,, jdemeyer

Report Upstream: None of the above - read trac for reasoning.

Authors: Jean-Pierre Flori

Dependencies: <a href="http://trac.sagemath.org/sage_trac/ticket/13324">trac #13324</a>, <a href="http://trac.sagemath.org/sage_trac/ticket/13860">trac #13860</a>

Work issues: 

Reviewers: Karl-Dieter Crisman, Jeroen Demeyer

Merged in: sage-5.7.beta1

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9167/spkg.diff">spkg.diff: Spkg diff, for review only. Not committed in spkg.</a> by jpflori at 20120820T16:53:45</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9167/spkg-take2.diff">spkg-take2.diff: For review only - based on JP's spkg</a> by kcrisman at 20121206T17:01:12</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9167/implib.patch">implib.patch: Patch to upstream build system.</a> by jpflori at 20121218T17:14:23</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9167/ecl-12.12.1.p1.diff">ecl-12.12.1.p1.diff: Spkg diff, for review only.</a> by jpflori at 20130118T10:54:08</li></ol>