Fix ext/rabbitmq/Rakefile to remove unnecessary files on install.

Author: jemc

ext/rabbitmq/Rakefile

@@ -4,7 +4,7 @@ require 'ffi'
 
 FILES = {}
 
-task :default => :build
+task :default => [:build, :compact]
 
 def self.file_task(filename, opts, &block)
   name, dep = opts.is_a?(Hash) ? opts.to_a.first : [opts, nil]
@@ -45,3 +45,9 @@ file_task "librabbitmq.#{::FFI::Platform::LIBSUFFIX}", :build => :configure do
   cmd "/usr/bin/env sh -c 'cd #{FILES[:download]} && make'"
   cmd "cp #{FILES[:download]}/librabbitmq/.libs/#{FILES[:build]} ."
 end
+
+task :compact => FILES[:build] do
+  FILES.each do |key, filename|
+    cmd "rm -rf #{filename}" unless key == :build
+  end
+end