* bus/activation.c: (bus_activation_init), (child_setup),
	(bus_activation_activate_service):
	* bus/activation.h:
	* bus/main.c: (main):
	Set DBUS_ADDRESS environment variable.

	* dbus/dbus-errors.c: (dbus_set_error):
	Don't use va_copy since that's a C99 feature.

	* dbus/dbus-sysdeps.c: (_dbus_setenv), (do_exec),
	(_dbus_spawn_async):
	* dbus/dbus-sysdeps.h:
	Add child_setup_func to _dbus_spawn_async.

	* doc/dbus-specification.sgml:
	Update specification.

	* test/spawn-test.c: (setup_func), (main):
	Fix test.