[1.0.X] Fixed #11030: fixed file uploads on non-utf8 filesystem encoding....

[1.0.X] Fixed #11030: fixed file uploads on non-utf8 filesystem encoding. Thanks, Honza Kral. Backport of [10693] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10695 bcc190cf-cafb-0310-a4f2-bffc1f526a37