secp521r1 removed from 1.4.6

[nginxu14]

Yeh I think MS just loves being crap and doing things wrong. Same from my
testing and research ive seen all browsers except MS support both DHE and
secp521r1.

Ive heard of support for a list of curves and then the best supported is
used but im not sure if browsers actually support this yet.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,248325,248404#msg-248404