rbuninstall.rb: fix for symlink to directory

* tool/rbuninstall.rb: fix for symlink to directory by removing
  trailing slash which let File.symlink?  return false.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39738 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* object.c (Init_Object): remove Module#used, which has been
  introduced in Ruby 2.0 by mistake.  [Bug #7916] [ruby-core:52719]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39739 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_file_exhaustive.rb: fix abolute root

* test/ruby/test_file_exhaustive.rb (test_expand_path_home_dir_string):
  fix abolute root path for dosish platforms.  [ruby-core:53354]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39740 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: fix for old shells

* configure.in (rm, shvar_to_cpp, unexpand_shvar): local is not
  available on old shells.
* configure.in (shvar_to_cpp): escape quotes for old shells.
  [Bug #7959] [Bug #8071]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e