elliptic_curves spkg is broken for system installs

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12763">trac #12763</a>.

diff for the spkg, for review only

Reported by: rohana

Component: build

CC: 

Report Upstream: N/A

Authors: R. Andrew Ohana

Dependencies: 

Work issues: 

Reviewers: François Bissey

Merged in: sage-5.0.beta12

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12763/elliptic_curves-0.6.diff">elliptic_curves-0.6.diff: diff for the spkg, for review only</a> by rohana at 20120328T01:16:17</li></ol>