Changes 1.45.0:
* Fixed a problem on kqueue-based platforms where a deadline_timer
  may never fire if the io_service is running in a background thread
* Fixed a const-correctness issue that prevented valid uses of
  has_service<> from compiling
* Fixed MinGW cross-compilation
* Removed dependency on deprecated Boost.System functions
* Ensured close()/closesocket() failures are correctly propagated
* Added a check for errors returned by
  InitializeCriticalSectionAndSpinCount
* Added support for hardware flow control on QNX
* Always use pselect() on HP-UX, if it is available.
* Ensured handler arguments are passed as lvalues
* Fixed Windows build when thread support is disabled
* Fixed a Windows-specific problem where deadline_timer objects with
  expiry times set more than 5 minutes in the future may never expire
* Fixed the resolver backend on BSD platforms so that an empty service
  name resolves to port number 0, as per the documentation
* Fixed read operations so that they do not accept buffer sequences of
  type const_buffers_1
* Redefined Protocol and id to avoid clashing with Objective-C++ keywords
* Fixed a vector reallocation performance issue that can occur when
  there are many active deadline_timer objects
* Fixed the kqueue backend so that it compiles on NetBSD
* Fixed the socket io_control() implementation on 64-bit Mac OS X and
  BSD platforms
* Fixed a Windows-specific problem where failures from accept() are
  incorrectly treated as successes
* Deprecated the separate compilation header <boost/asio/impl/src.cpp>
  in favour of <boost/asio/impl/src.hpp>

(adam)