--cmd-type options.  [ruby-dev:33816]

* instruby.rb (parse_args): added bin-arch and bin-comm to install
  type, for compiled files and script files.

* instruby.rb (parse_args): deal with make style command line macros,
  and count as long syle options if prefixed with INSTALL_.

* instruby.rb (makedirs): use $dir_mode.  [ruby-dev:33805]

* instruby.rb (open_for_install): set file mode, which is now
  permission mode instead of access mode.

* instruby.rb (bin-comm): installs scripts with replacing shebang
  lines.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15552 b2dd03c8-39d4-4d8f-98ff-823fe69b080e