Upgrade Givaro to version 3.7.0

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/9511">trac #9511</a>.

Rebased patch

Reported by: pcpa

Component: givaro

CC: zimmerma,, jpflori

Report Upstream: Reported upstream. Developers acknowledge bug.

Authors: 

Dependencies: 

Work issues: 

Reviewers: Volker Braun

Merged in: 

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9511/trac_9511_givaro_3_7_x.patch">trac_9511_givaro_3_7_x.patch: </a> by malb at 20120624T15:00:51</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9511/givaro-3.2.13-3.7.0.diff">givaro-3.2.13-3.7.0.diff: Diff between the 3.2.13.p0 (#12761) and 3.7.0 givaro spkgs. For review only. </a> by jdemeyer at 20120627T20:35:27</li><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/9511/trac_9511_givaro_3_7_x.2.patch">trac_9511_givaro_3_7_x.2.patch: Rebased patch</a> by vbraun at 20120814T02:32:47</li></ol>