net-p2p/libtorrent-rasterbar: unbreak with boost 1.67

In file included from disk_buffer_holder.cpp:34:
In file included from ../include/libtorrent/aux_/session_impl.hpp:73:
../include/libtorrent/ip_filter.hpp:168:34: error: no member named 'prior' in namespace 'boost'; did you mean

'perror'?
                  boost::uint32_t last_access = boost::prior(j)->access;
                                                ^~~~~~~~~~~~
                                                perror

/usr/include/stdio.h:266:7: note: 'perror' declared here
void perror(const char *);

^

In file included from disk_buffer_holder.cpp:34:
In file included from ../include/libtorrent/aux_/session_impl.hpp:73:
../include/libtorrent/ip_filter.hpp:174:43: error: no member named 'prior' in namespace 'boost'; did you mean

'perror'?
                  else if (i != m_access_list.begin() && boost::prior(i)->access == flags)
                                                         ^~~~~~~~~~~~
                                                         perror

/usr/include/stdio.h:266:7: note: 'perror' declared here
void perror(const char *);

^

In file included from disk_buffer_holder.cpp:34:
In file included from ../include/libtorrent/aux_/session_impl.hpp:73:
../include/libtorrent/ip_filter.hpp:182:43: error: no member named 'next' in namespace 'boost'

if (i != j) m_access_list.erase(boost::next(i), j);
                                ~~~~~~~^

kademlia/routing_table.cpp:716:26: error: no member named 'next' in namespace 'boost'; did you mean 'std::next'?

bool const can_split = (boost::next(i) == m_buckets.end()
                        ^~~~~~~~~~~
                        std::next

/usr/include/c++/v1/iterator:519:1: note: 'std::next' declared here
next(_ForwardIter __x,
^
kademlia/routing_table.cpp:719:40: error: no member named 'prior' in namespace 'boost'

&& (i == m_buckets.begin() || boost::prior(i)->live_nodes.size() > 1);
                              ~~~~~~~^

PR: 227427
Obtained from: upstream