Remove several more relative imports.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17007 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/widgets.py

@@ -2,13 +2,15 @@
 HTML Widget classes
 """
 
+from __future__ import absolute_import
+
 import copy
 import datetime
 from itertools import chain
 from urlparse import urljoin
-from util import flatatt
 
 from django.conf import settings
+from django.forms.util import flatatt
 from django.utils.datastructures import MultiValueDict, MergeDict
 from django.utils.html import escape, conditional_escape
 from django.utils.translation import ugettext, ugettext_lazy