exclude NSButton+Kingfisher.swift in iOS, tvos and watchOS

Kingfisher.podspec

@@ -36,7 +36,9 @@ Pod::Spec.new do |s|
   s.public_header_files = ["Sources/Kingfisher.h"]
   
   s.osx.exclude_files = "Sources/UIButton+Kingfisher.swift"
-  s.watchos.exclude_files = ["Sources/UIButton+Kingfisher.swift", "Sources/ImageView+Kingfisher.swift"]
+  s.watchos.exclude_files = ["Sources/UIButton+Kingfisher.swift", "Sources/ImageView+Kingfisher.swift", "Sources/NSButton+Kingfisher.swift"]
+  s.ios.exclude_files = "Sources/NSButton+Kingfisher.swift"
+  s.tvos.exclude_files = "Sources/NSButton+Kingfisher.swift"
   
   s.requires_arc = true
   s.framework = "CFNetwork"