Move oldest_cpu to Hardware

Library/Homebrew/extend/ENV.rb

@@ -328,7 +328,7 @@ module HomebrewEnvExtension
     append flags, xarch unless xarch.empty?
 
     if ARGV.build_bottle?
-      append flags, Hardware::CPU.optimization_flags[MacOS.oldest_cpu]
+      append flags, Hardware::CPU.optimization_flags[Hardware.oldest_cpu]
     else
       # Don't set -msse3 and older flags because -march does that for us
       append flags, map.fetch(Hardware::CPU.family, default)

Library/Homebrew/hardware.rb

@@ -45,4 +45,16 @@ class Hardware
       Hardware.processor_count
     end
   end
+
+  def self.oldest_cpu
+    if Hardware::CPU.type == :intel
+      if Hardware::CPU.is_64_bit?
+        :core2
+      else
+        :core
+      end
+    else
+      Hardware::CPU.family
+    end
+  end
 end

Library/Homebrew/macos.rb

@@ -28,18 +28,6 @@ module MacOS extend self
     end
   end
 
-  def oldest_cpu
-    if Hardware::CPU.type == :intel
-      if Hardware::CPU.is_64_bit?
-        :core2
-      else
-        :core
-      end
-    else
-      Hardware::CPU.family
-    end
-  end
-
   def locate tool
     # Don't call tools (cc, make, strip, etc.) directly!
     # Give the name of the binary you look for as a string to this method