fixed the path splitting

Lib/packaging/compiler/msvc9compiler.py

@@ -356,7 +356,8 @@ class MSVCCompiler(CCompiler) :
             vc_env = query_vcvarsall(VERSION, plat_spec)
 
             # take care to only use strings in the environment.
-            self.__paths = vc_env['path'].split(os.pathsep).encode('mbcs')
+            self.__paths = [part.encode('mbcs') for part in
+                            vc_env['path'].split(os.pathsep)]
             os.environ['lib'] = vc_env['lib'].encode('mbcs')
             os.environ['include'] = vc_env['include'].encode('mbcs')