Fix issue with platforms that include an openssl that doesn't support SHA256.
Fix issue with platforms that include an openssl that doesn't support SHA256.


git-svn-id: bee8fd0f8e0815e8ea0c22dfae6affac2de52234@7341 9f0cbaf6-ce18-0410-ad37-d14a22affa91

zuazo-forks/right_aws,rightscale/right_aws,envato/right_aws,gentoo/right_aws