* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39787 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39558: [Backport #7991]

	* lib/rubygems/ext/ext_conf_builder.rb (Gem::Ext::ExtConfBuilder.build):
	  revert use of temporary directory for build, to work some buggy
	  extconf.rb which cannot build outside the source directory.
	  [ruby-core:53056] [Bug #7698]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39559: [Backport #7991]

	* lib/rubygems/ext/ext_conf_builder.rb (Gem::Ext::ExtConfBuilder.build):
	  use RUBYOPT instead of -r option, and revert some tests.  [Bug #7698]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39789 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39560,39562,39572: [Backport #7991]

	* lib/rubygems/ext/ext_conf_builder.rb
	  (Gem::Ext::ExtConfBuilder.hack_for_obsolete_sytle_gems): remove
	  circular dependencies for old style gems which locate extconf.rb on
	  the toplevel.  [ruby-core:53059] [ruby-trunk - Bug #7698]
	  (Gem::Ext::ExtConfBuilder.hack_for_obsolete_style_gems): remove

	* lib/rubygems/ext/ext_conf_builder.rb
	  (Gem::Ext::ExtConfBuilder.hack_for_obsolete_style_gems): remove
	  circular dependencies in install-so too.  [ruby-core:52882]
	  [Bug #7698]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39790 b2dd03c8-39d4-4d8f-98ff-823fe69b080e