support ETIMEDOUT error

sblist: update to latest libulz version

fix rfc1929 user/pass auth subnegotation response version field

the version field is repurposed here to mean "version of the subnegotation",
which in this case is 1, not 5, as intuitively expected.
interestingly, most socks5 clients don't check the version respond, rather
only the success field.

ignore SIGPIPE

use n_methods to adhere to the protocol