restrict socks5 UDP tunnels to match the address family of the UDP so…

[arvidn]

…cket

[codecov-io]

Codecov Report

Merging #4209 into RC_1_2 will increase coverage by 0.16%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           RC_1_2    #4209      +/-   ##
==========================================
+ Coverage   74.62%   74.78%   +0.16%     
==========================================
  Files         439      439              
  Lines       60582    60600      +18     
  Branches     8962     8966       +4     
==========================================
+ Hits        45208    45321     +113     
+ Misses      10871    10792      -79     
+ Partials     4503     4487      -16

Impacted Files	Coverage Δ
include/libtorrent/udp_socket.hpp	77.77% <ø> (ø)	⬆️
src/socks5_stream.cpp	59.48% <100%> (+1.5%)	⬆️
src/udp_socket.cpp	53.07% <78.57%> (+0.91%)	⬆️
src/choker.cpp	17.07% <0%> (-4.88%)	⬇️
test/web_seed_suite.cpp	89% <0%> (-1.5%)	⬇️
src/close_reason.cpp	20% <0%> (-1.12%)	⬇️
src/request_blocks.cpp	79.24% <0%> (-0.95%)	⬇️
include/libtorrent/peer_connection.hpp	71.79% <0%> (-0.86%)	⬇️
include/libtorrent/torrent.hpp	81.48% <0%> (-0.62%)	⬇️
src/block_cache.cpp	75.46% <0%> (-0.4%)	⬇️
... and 27 more

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[arvidn]

I'm working on a more comprehensive patch that will do this better. I will probably not land this one

[arvidn]

superseded by #4249