Cleanup pkg when pushing gems

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@963 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

pushgems.rb

@@ -4,5 +4,5 @@
 
 (%w( actionwebservice actionmailer actionpack activerecord railties activesupport) - ARGV).each do |pkg|
   puts "Pushing: #{pkg} (#{build_number})"
-  `cd #{pkg} && PKG_BUILD=#{build_number} rake pgem && cd ..`
+  `cd #{pkg} && rm -rf pkg && PKG_BUILD=#{build_number} rake pgem && cd ..`
 end