Fixed build problem with options --with-asio=system.
Fixed build problem with options --with-asio=system.

TeoTwawki/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,TeoTwawki/libtorrent,snowyu/libtorrent,snowyu/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,hamedramzi/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,TeoTwawki/libtorrent,snowyu/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,hamedramzi/libtorrent