Remove two more unnecessary default arguments

Library/Homebrew/keg_fix_install_names.rb

@@ -133,7 +133,7 @@ class Keg
     dylibs.each(&block)
   end
 
-  def dylib_id_for file, options={}
+  def dylib_id_for(file, options)
     # The new dylib ID should have the same basename as the old dylib ID, not
     # the basename of the file itself.
     basename = File.basename(file.dylib_id)

Library/Homebrew/requirement.rb

@@ -126,7 +126,7 @@ class Requirement
   end
 
   class Satisfier
-    def initialize(options={}, &block)
+    def initialize(options, &block)
       case options
       when Hash
         @options = { :build_env => true }