Fix Mail::Exim, forgotten in 4875bc2

The parameters of Mail::Sendmail.call changed in 4875bc2 but
Mail::Exim was not changed accordingly.

Fixes #689

CHANGELOG.rdoc

@@ -33,6 +33,7 @@ Bugs:
 * #539 - Fix that whitespace-only continued headers would be incorrectly parsed as the break between headers and body. (ConradIrwin)
 * #605 - Fix Mail::Address#name for nil addresses (peterkovacs)
 * #684 - Fix recursively fetching attachments from an embedded message/rfc822 part whose Content-Type header has additional parameters. (vongruenigen)
+* #689 - Fix Exim delivery method broken by #477 in 2.5.4. (jethrogb)
 * #792 - Allow blank filenames in Content-Disposition field. (robinroestenburg)
 * #876 - Strip valid RFC-1342 separator characters between non-matching encoded-words (Caleb W. Corliss)
 * #876 - Fix that Mail::Message#add_file was adding a stray filename header (kirikak2)

lib/mail/network/delivery_methods/exim.rb

@@ -37,17 +37,13 @@ module Mail
   #
   #   mail.deliver!
   class Exim < Sendmail
-    def initialize(values)
-      self.settings = { :location       => '/usr/sbin/exim',
-                        :arguments      => '-i -t' }.merge(values)
-    end
+    DEFAULTS = {
+      :location   => '/usr/sbin/exim',
+      :arguments  => '-i -t'
+    }
 
-    def self.call(path, arguments, destinations, mail)
-      popen "#{path} #{arguments}" do |io|
-        io.puts ::Mail::Utilities.to_lf(mail.encoded)
-        io.flush
-      end
+    def self.call(path, arguments, destinations, encoded_message)
+      super path, arguments, nil, encoded_message
     end
-
   end
 end

lib/mail/network/delivery_methods/sendmail.rb

@@ -38,11 +38,15 @@ module Mail
   #
   #   mail.deliver!
   class Sendmail
+    DEFAULTS = {
+      :location   => '/usr/sbin/sendmail',
+      :arguments  => '-i'
+    }
+
     attr_accessor :settings
 
     def initialize(values)
-      self.settings = { :location       => '/usr/sbin/sendmail',
-                        :arguments      => '-i' }.merge(values)
+      self.settings = self.class::DEFAULTS.merge(values)
     end
 
     def deliver!(mail)