Fix bind/connect/sendto issue because of bad addrlen. #251
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In 4aa361d, the SOCK_ADDR_SIZE macro was removed and in bind(),
connect() and sendto() calls, it was replaced with sizeof(struct
sockaddr_storage). Unfortunately some systems (OSX) refuse to work
with an inexact (too large) addrlen.
Thanks to @sjthomason for reporting and bisecting the cause.
Closes #246.