title: Xcode 9 beta new build system fails with "unable to build node" error
body: <p>It seems like Xcode 9 beta does not like "~ipad" in filenames for .xib files. When selecting the new build system (for a project, that is compiling successfully with the old build system), it errors out with:</p>
  
  <blockquote>
    <p>unable to build node:
    '/Users/dev/Library/Developer/Xcode/DerivedData/proj-aiatvieseyfwjkfqncikqcohpdsn/Build/Products/Debug-iphoneos/proj.app/Controller~ipad.nib'
    (node is produced by multiple commands; e.g.,
    'adf8a93da84709e14beaf35ec6d6d21c02c34dc4669b6bd1e18a027ff75b53b5:CompileXIB
    /Users/dev/git/proj/Resources/Controllers/Controller.xib' and
    'adf8a93da84709e14beaf35ec6d6d21c02c34dc4669b6bd1e18a027ff75b53b5:CompileXIB
    /Users/dev/git/proj/Resources/Controllers/Controller~ipad.xib')</p>
  </blockquote>
  
  <p>Should I rename them or is there another solution?</p>