[ImageMagick/f21] (4 commits) ...Fix 6 security issues

[Pavel Alexeev]

Summary of changes:

  3645110... - Build 6.8.7-0 version because soname bump happened in new (*)
  001f14d... - Build 6.8.6-3 version because soname bump happened in new (*)
  86767a6... Backport patches to fix CVE-2014-8354 and CVE-2014-8355 in  (*)
  a758163... Fix 6 security issues

(*) This commit already existed in another branch; no separate mail sent