Libiqxmlrpc 0.8.6 released.

0.8.5 - 0.8.6
Several fixes related to starting/stopping server:
* Server no longer wait for all open connections to close on exit.
This is much more secure behavior.
* Now it is safe using the same Server object after work/set_exit_flag cycle.
* Fix thread-leaks in Pool_executor_factory.

Compilation fix on Windows