PR 9871/11338 fix in tcpmib.stp by removing embedded-C and using @defined.

PR 9871/11338 fix in tcpmib.stp by removing embedded-C and using @defined.

* tapset/tcpmib.stp (tcpmib_get_state): Changed from embedded-C to script
  code.
  (tcpmib_local_addr): Instead of an embedded-C function, now calls
  function from ip.stp/tcp.stp.
  (tcpmib_remote_addr): Ditto.
  (tcpmib_local_port): Ditto.
  (tcpmib_remote_port): Ditto.
  (tcpmib.OutRsts.A): Used '@defined' instead of a kernel version check.
* tapset/ip.stp (__ip_sock_saddr): Used '@defined' instead of a kernel
  version check.  Added RHEL4 support.
  (__ip_sock_daddr): Ditto.
* tapset/tcp.stp (__tcp_sock_dport): Ditto.
  (__tcp_sock_sport): Ditto.