* staprun.h (VERSION_CMD): Command to use for version check.
Changes to support runtime decision on new or old transport.
* mainloop.c (init_staprun): Check the kernel version at runtime
instead of at compile time.
(cleanup_and_exit): Call the correct relayfs close function.
(stp_main_loop): Call the correct relayfs init function.
* relay.c: Remove ifdef wrapper. File is always compiled and used
if the kernel version is appropriate.
* relay_old.c: Ditto.