Merge branch 'maint-0.4.5' into maint-0.4.6

  o Minor bugfixes (compatibility):

    - Fix compatibility with the most recent Libevent versions, which

      no longer have an evdns_set_random_bytes() function.  Because

      this function has been a no-op since Libevent 2.0.4-alpha,

      it is safe for us to just stop calling it.  Fixes bug 40371;

      bugfix on 0.2.1.7-alpha.

  tor_log(severity, LD_EXIT, "eventdns: %s", msg);

}

/** Helper: passed to eventdns.c as a callback so it can generate random

 * numbers for transaction IDs and 0x20-hack coding. */

static void

dns_randfn_(char *b, size_t n)

{

  crypto_rand(b,n);

}

/** Initialize the DNS subsystem; called by the OR process. */

int

dns_init(void)

{

  init_cache_map();

  evdns_set_random_bytes_fn(dns_randfn_);

  if (server_mode(get_options())) {

    int r = configure_nameservers(1);

    return r;