[openttd/f18] (5 commits) ...Merge branch 'master' into f18

[Felix Kaechele]

Summary of changes:

  80fa31e... update to the 1.3.1-RC1 (*)
  0eaeea8... update to 1.3.2-RC1 (*)
  ebe3f7f... rebuild for ICU ABI break (*)
  7242f69... update to 1.3.2 (*)
  62cf68d... Merge branch 'master' into f18

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