* lib/rubygems/ext/builder.rb:  Fix incompatibilities when installing
  extensions.  Patch by Nobu.
  [ruby-trunk - Bug #7968] [ruby-trunk - Bug #7971]
* lib/rubygems/ext/ext_conf_builder.rb:  ditto.
* lib/rubygems/installer.rb:  ditto.
* test/rubygems/test_gem_ext_ext_conf_builder.rb:  Test for the above.
* test/rubygems/test_gem_installer.rb:  ditto.

* lib/rubygems/commands/sources_command.rb:  Prefer HTTPS over HTTP.
* lib/rubygems/defaults.rb:  ditto
* lib/rubygems/dependency_resolver.rb:  Ditto.
* lib/rubygems/source.rb:  ditto.
* lib/rubygems/spec_fetcher.rb:  ditto.
* lib/rubygems/specification.rb:  ditto.
* lib/rubygems/test_utilities.rb:  ditto.
* test/rubygems/test_gem.rb:  Test for the above.
* test/rubygems/test_gem_commands_sources_command.rb:  ditto.
* test/rubygems/test_gem_dependency_resolver_api_set.rb:  ditto.
* test/rubygems/test_gem_remote_fetcher.rb:  ditto.
* test/rubygems/test_gem_source.rb:  ditto.
* test/rubygems/test_gem_spec_fetcher.rb:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39542 b2dd03c8-39d4-4d8f-98ff-823fe69b080e