rb_io_mode_flags.
  (rb_io_modestr_oflags): renamed from rb_io_mode_modenum.
  (rb_io_oflags_fmode): renamed from rb_io_modenum_flags.
  (rb_io_mode_flags): defined as a macro.
  (rb_io_modenum_flags): ditto.

* io.c: follow the renaming with consistency.

* process.c (check_exec_redirect): call rb_io_modestr_oflags.

* ext/pty/depend: pty.o depends on io.h.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19153 b2dd03c8-39d4-4d8f-98ff-823fe69b080e