Fixes #110 - Support different so suffixes
Created originally on Bitbucket by dstufft (Donald Stufft)
Was already merged in Bitbucket before import, marked as merged by the import user
Source changeset not longer availableat the time of import. Commit listwill look empty
Different versions of distutils on different OSs build out the .so's with different suffixes. Currently cffi just assumes that whatever the highest priority C suffix is, is what it will be built with. This fixes that so it supports any of the C suffixes.