v1.2.1-rc2

• Fixed SF#334. Handle signal interrupting sem_wait().

• Avoid language level thread-local variables on Cygwin to avoid
  compilation issue (GCC PR64697).

• Implement suggestion in SF#297 to allow filters in AsyncAppender
  configuration.

• Require CMake 2.8.12 and later due to use of INCLUDES DESTINATION
  (Patched by Enrico Jorns.)

• Fixed GitHub bug #136, again. Use mktime()'s ability to adjust for
  excess values in fields of struct tm.

• SocketBuffer now throws an exception on overflow and SocketAppender
  handles it and does not send overlong messages.

• Fixed SF#343. Avoid using C++11 std::mutex and other synchronization
  primitives in Visual Studio earlier than 2015.
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