Revert "test/rdoc: avoid tempfile leaks"

This reverts commit r46145.

Tempfile.create is only available Ruby 2.1 or higher.
rubygems need to support Ruby 1.9 and 2.0 series.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46683 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rubygems/test_gem_package.rb

@@ -621,7 +621,7 @@ class TestGemPackage < Gem::Package::TarTestCase
   end
 
   def test_verify_corrupt
-    Tempfile.create 'corrupt' do |io|
+    Tempfile.open 'corrupt' do |io|
       data = Gem.gzip 'a' * 10
       io.write \
         tar_file_header('metadata.gz', "\000x", 0644, data.length, Time.now)

test/rubygems/test_gem_request_set.rb

@@ -156,7 +156,7 @@ DEPENDENCIES
   def test_load_gemdeps
     rs = Gem::RequestSet.new
 
-    Tempfile.create 'gem.deps.rb' do |io|
+    Tempfile.open 'gem.deps.rb' do |io|
       io.puts 'gem "a"'
       io.flush
 
@@ -172,7 +172,7 @@ DEPENDENCIES
   def test_load_gemdeps_without_groups
     rs = Gem::RequestSet.new
 
-    Tempfile.create 'gem.deps.rb' do |io|
+    Tempfile.open 'gem.deps.rb' do |io|
       io.puts 'gem "a", :group => :test'
       io.flush
 
@@ -202,7 +202,7 @@ DEPENDENCIES
 
     rs = Gem::RequestSet.new
 
-    Tempfile.create 'gem.deps.rb' do |io|
+    Tempfile.open 'gem.deps.rb' do |io|
       io.puts <<-gems_deps_rb
         gem "#{name}", :git => "#{repository}"
       gems_deps_rb
@@ -263,7 +263,7 @@ DEPENDENCIES
 
     rs = Gem::RequestSet.new
 
-    Tempfile.create 'gem.deps.rb' do |io|
+    Tempfile.open 'gem.deps.rb' do |io|
       io.puts <<-gems_deps_rb
         gem "#{a_name}", :path => "#{a_directory}"
         gem "#{b_name}", :path => "#{b_directory}"

test/rubygems/test_gem_request_set_gem_dependency_api.rb

@@ -492,7 +492,7 @@ class TestGemRequestSetGemDependencyAPI < Gem::TestCase
   end
 
   def test_load
-    Tempfile.create 'gem.deps.rb' do |io|
+    Tempfile.open 'gem.deps.rb' do |io|
       io.write <<-GEM_DEPS
 gem 'a'