make linux behaviour the default. override only for macos

Library/Homebrew/dependency_collector.rb

@@ -135,6 +135,10 @@ class DependencyCollector
     end
   end
 
+  def ant_dep(spec, tags)
+    Dependency.new(spec.to_s, tags)
+  end
+
   def resource_dep(spec, tags)
     tags << :build
     strategy = spec.download_strategy

Library/Homebrew/extend/os/dependency_collector.rb

@@ -2,6 +2,4 @@ require "dependency_collector"
 
 if OS.mac?
   require "extend/os/mac/dependency_collector"
-elsif OS.linux?
-  require "extend/os/linux/dependency_collector"
 end

Library/Homebrew/extend/os/linux/dependency_collector.rb

@@ -1,5 +0,0 @@
-class DependencyCollector
-  def ant_dep(spec, tags)
-    Dependency.new(spec.to_s, tags)
-  end
-end