Fixed #7921: for sqlite3 2.4.1 or later, adapt str objects to unicode, thus...

Fixed #7921: for sqlite3 2.4.1 or later, adapt str objects to unicode, thus preveting weird failures with 8-bit bytestrings. Martin von Löwis and Karen Tracey tracked this one down -- thanks!


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8276 bcc190cf-cafb-0310-a4f2-bffc1f526a37