[akonadi/f21] (6 commits) ...latest 1.13 branch fixes

[Rex Dieter]

Summary of changes:

  b80c244... explicitly s/mysql-server/mariadb-server/ (*)
  002028f... explicitly Requires: mariadb-server/mysql-server as appropr (*)
  8acc3d6... latest 1.13 branch fixes (*)
  f8437d9... drop el6/cmake hacks (*)
  ea4f267... Rebuild for boost 1.57.0 (*)
  adf30af... latest 1.13 branch fixes (*)

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