D4630: Only register APPLE_* options if(APPLE)

[Aleix Pol Gonzalez]

apol added a comment.


  If nobody reviews I'll push during the next week.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D4630

To: apol, #frameworks
Cc: #build_system
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