* configure.in: add missing check for recvmsg.
* gnome-pty-helper/gnome-login-support.c: formatting and spelling fixes.
* gnome-pty-helper/gnome-login-support.c(n_read): reorganize.
* gnome-pty-helper/gnome-login-support.c(n_write): add.
* gnome-pty-helper/gnome-login-support.h: add prototype for n_write.
* gnome-pty-helper/gnome-pty-helper.c: only define the I_SENDFD version of
	pass_fd() if I_SENDFD is defined, to clarify compile errors when it
	isn't defined.
* src/pty.c(main): exercise session logging.
* src/pty.c(_vte_pty_open_with_helper): add more debug messages.