On OSX we should not pass the -shared option to ld: it make the build

of audioop and cmath fail. Removing it seems to have no adverse consequences.

Closes bug #450510.

setup.py

@@ -141,7 +141,10 @@ class PyBuildExt(build_ext):
             (ccshared,opt) = sysconfig.get_config_vars('CCSHARED','OPT')
             args['compiler_so'] = compiler + ' ' + opt + ' ' + ccshared
         if linker_so is not None:
-            args['linker_so'] = linker_so + ' -shared'
+            if platform == 'darwin1':
+                args['linker_so'] = linker_so
+            else:
+                args['linker_so'] = linker_so + ' -shared'
         self.compiler.set_executables(**args)
 
         build_ext.build_extensions(self)