Remove rusty workaround for ancient MacOSX'es.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1529 b0c55286-4f34-0410-a049-a1e7e93b0762
Merge branch 'master' of git://github.com/hemmecke/fricas-svn into macosx-build