RELENG_4_5 haru veaparandused

RELENG_4_5 harus tehti mitmeid olulisi veaparandusi:

  Modified files:        (Branch: RELENG_4_5)
    sys/netinet          ip_icmp.c ip_mroute.c ip_output.c
  Log:
  MFC ip_icmp.c 1.69, ip_mroute.c 1.72, ip_output.c 1.153:
  Fixed IP routing table leak in icmp_reflect().

  Modified files:        (Branch: RELENG_4_5)
    sys/vm               vm_map.c
  Log:
  MFC 1.213: Fix mmap/msync bug which can panic the kernel.

  Modified files:        (Branch: RELENG_4_5)
    sys/netinet          tcp_input.c
  Log:
  MFC 1.148, 1.149: The TCP code did not do sufficient checks on whether
  incoming packets were destined for a broadcast IP address.