gdmodule: don't use /sw and /usr/local paths

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/12909">trac #12909</a>.



Reported by: jdemeyer

Component: packages

CC: 

Report Upstream: N/A

Authors: Robert Bradshaw, Jeroen Demeyer

Dependencies: 

Work issues: 

Reviewers: Volker Braun

Merged in: sage-5.0.rc1

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/12909/gdmodule-0.56.p7-p8.diff">gdmodule-0.56.p7-p8.diff: </a> by jdemeyer at 20120507T15:19:32</li></ol>