Fixed Python 2.4 incompatibility introduced in [14218]
Fixed Python 2.4 incompatibility introduced in [14218]

sha_constructor was incorrectly used instead of sha_hmac (which only made a
difference under 2.4).

Thanks to Steffan Kaminski for report and patch.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@14233 bcc190cf-cafb-0310-a4f2-bffc1f526a37

alex/django-old,jamespacileo/django-france,skevy/django,django-nonrel/django-nonrel,Instagram/django,disqus/django-old,django-nonrel/django-nonrel,mitsuhiko/django,mitsuhiko/django,skevy/django,disqus/django-old,skevy/django,jamespacileo/django-france,Instagram/django,mitsuhiko/django,jamespacileo/django-france,alex/django-old,Instagram/django,django-nonrel/django-nonrel,alex/django-old,disqus/django-old