Remove macOS implementation of #arch_compatible?

We don't really need this.

Library/Homebrew/extend/pathname.rb

@@ -471,7 +471,7 @@ class Pathname
 
   sig { params(_wanted_arch: Symbol).returns(T::Boolean) }
   def arch_compatible?(_wanted_arch)
-    false
+    true
   end
 
   sig { returns(T::Array[String]) }

Library/Homebrew/os/mac/mach.rb

@@ -155,13 +155,6 @@ module MachOShim
     arch == :ppc64
   end
 
-  def arch_compatible?(wanted_arch)
-    return true unless mach_data.present?
-    return arch == wanted_arch unless universal?
-
-    archs.include?(wanted_arch)
-  end
-
   def dylib?
     mach_data.any? { |m| m.fetch(:type) == :dylib }
   end