Code review comment for lp:~widelands-dev/widelands/fix_osx_nightlies

This has broken all the Linux builds on Travis:

-- Found ICU: /usr/lib/x86_64-linux-gnu/libicuuc.so (found version "52.1.0")
CMake Error at CMakeLists.txt:84 (if):
  if given arguments:
    "APPLE" "AND" "GREATER" "11"
  Unknown arguments specified
-- Configuring incomplete, errors occurred!