[1.0.X] Fixed #9659: fixed `wsgi.file_wrapper` in the builtin server. Thanks,...

[1.0.X] Fixed #9659: fixed `wsgi.file_wrapper` in the builtin server. Thanks, mitsuhiko. Backport of [10690] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10691 bcc190cf-cafb-0310-a4f2-bffc1f526a37