clean deep into lib and bin dirs

Library/Homebrew/brewkit.rb

@@ -212,11 +212,11 @@ public
   end
 
   def clean
-    prefix.find do |path|
+    [bin,lib].each {|path| path.find do |path|
-      if path==prefix #rubysucks
+      if not path.file?
         next
-      elsif path.file?
+      elsif path.extname == '.la'
-        if path.extname == '.la'
+        # .la files are stupid
         path.unlink
       else
         fo=`file -h #{path}`
@@ -228,10 +228,7 @@ public
           `strip #{args} #{path}`
         end
       end
-      elsif path.directory? and path!=prefix+'bin' and path!=prefix+'lib'
+    end}
-        Find.prune
-      end
-    end
   end
 
 protected