linking:

  CXXLD    libtorrent-rasterbar.la
ld: .libs/torrent.o(.text+0x18f16): unresolvable relocation against symbol `_ZNKSs5emptyEv'
ld: final link failed: Nonrepresentable section on output

probably related to:

https://code.google.com/p/libtorrent/issues/detail?id=382
http://comments.gmane.org/gmane.comp.lib.boost.build/25685

patch-src_Makefile.in linking works, the lib is usable,
and the patch should be improved.

CVE-2016-5301
