version bump to latest 2012.55 to 2013.58
also added a netbsd-specific build option

(changes)
2013.58 - Thursday 18 April 2013

- Fix building with Zlib disabled, thanks to Hans Harder and cuma@freetz

- Use % as a separator for ports, fixes scp in multihop mode, from Hans Harder

- Reject logins for other users when running as non-root, from Hans Harder

- Disable client immediate authentication request by default, it prevents
  passwordless logins from working

2013.57 - Monday 15 April 2013

- Decreased connection setup time particularly with high latency connections,
  the number of round trips has been reduced for both client and server.
  CPU time hasn't been changed.

- Client will send an initial key exchange guess to save a round trip.
  Dropbear implements an extension kexguess2@matt.ucc.asn.au to allow the first
  packet guess to succeed in wider circumstances than the standard behaviour.
  When communicating with other implementations the standard behaviour is used.

- Client side: when public key or password authentication with
  $DROPBEAR_PASSWORD is used an initial authentication request will
  be sent immediately rather than querying the list of available methods.
  This behaviour is enabled by CLI_IMMEDIATE_AUTH option (on by default),
  please let the Dropbear author know if it causes any interoperability
  problems.

- Implement client escape characters ~. (terminate session) and
  ~^Z (background session)

- Server will more reliably clean up utmp when connection is closed, reported by
  Mattias Walstr<C3><B6>m
- Don't crash if /dev/urandom isn't writable (RHEL5), thanks to Scott Case

- Add "-y -y" client option to skip host key checking, thanks to Hans Harder

- scp didn't work properly on systems using vfork(), thanks to Frank Van Uffelen

- Added IUTF8 terminal mode support (Linux and Mac OS). Not standardised yet
though probably will be soon

- Some verbose DROPBEAR_TRACE output is now hidden unless $DROPBEAR_TRACE2
  enviroment variable is set

- Fix using asymmetric MAC algorithms (broke in )

- Renamed configure.in to configure.ac to quieten autoconf, from Mike Frysinger

2013.56 - Thursday 21 March 2013

- Allow specifying cipher (-c) and MAC (-m) lists for dbclient

- Allow using 'none' cipher or MAC (off by default, use options.h). Encryption
  is used during authentication then disabled, similar to OpenSSH HPN mode

- Allow a user in immediately if the account has a blank password and blank
  passwords are enabled

- Include a few extra sources of entropy from /proc on Linux, hash private keys
  as well. Dropbear will also write gathered entropy back into /dev/urandom

- Added hmac-sha2-256 and hmac-sha2-512 support (off by default, use options.h)

- Don't sent bad address "localhost" for -R forward connections,
  reported by Denis Bider

- Add "-B" runtime option to allow blank passwords

- Allow using IPv6 bracket notation for addresses in server "-p" option, from Ben Jencks

- A few improvements for Android from Reimar D<C3><B6>ffinger

- Fix memory leak for TCP forwarded connections to hosts that timed out,
  reported by Norbert Bencz<C3><BA>r. Appears to be a very long-standing bug.

- Fix "make clean" for out of tree builds

- Fix compilation when ENABLE_{SVR,CLI}_AGENTFWD are unset
Updated security/dropbear to 2013.58