boost 1.53 比1.52 ASIO bug 修正

Asio:
  • Fixed some 64-to-32-bit conversion warnings ( #7459).
  • Fixed some small errors in documentation and comments ( #7761).
  • Fixed an error in the example embedded in  basic_socket::get_option's documentation ( #7562).
  • Changed to use  long rather than  int for SSL_CTX options, to match OpenSSL ( #7209).
  • Changed to use  _snwprintf to address a compile error due to the changed  swprintf signature in recent versions of MinGW ( #7373).
  • Fixed a deadlock that can occur on Windows when shutting down a pool of  io_service threads due to running out of work ( #7552).
  • Enabled the  noexcept qualifier for error categories ( #7797).
  • Changed UNIX domain socket example to treat errors from  accept as non-fatal ( #7488).
  • Added a small block recycling optimisation to improve default memory allocation behaviour.

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