Updated security/ssdeep to version 2.11

Quoted from http://jessekornblum.livejournal.com/295883.html:

  This is an important update, which corrects a bug in the signature
  generation code. Any ssdeep hashes created with version 2.10 should be
  recomputed. The signatures are not wrong per se though, they are just not
  as good as they should be"

(khorben)