[widelands/f20] (5 commits) ...Update to new upstream Build18 release (rhbz#1085517)

[Hans de Goede]

Summary of changes:

  e29e70a... rebuilt for GLEW 1.10 (*)
  2894f07... use string literals as format strings (#1037384) (*)
  6fbaf9c... Rebuild for boost 1.55.0 (*)
  f09f799... - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_Mass (*)
  7d7bd04... Update to new upstream Build18 release (rhbz#1085517) (*)

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