Port to MinGW
Merge branch 'release/1.2.4' into develop
Only check for 100-continue is enabled for servers, not clients.
Only decrement the thread backlog if it is a server.
Use MSYS Makefiles instead of MinGW Makefiles
Merge branch 'master' of git://github.com/haiwen/libevhtp into haiwen-master

Conflicts:
	CMakeLists.txt
Merge branch 'haiwen-master' into develop
v1.2.5, see ChangeLog for details.
Merge branch 'release/1.2.5'
Fix double free for evthr at shutdown

If you use threads, than you get this segfault.

There was two calls to evthr_free() on shutdown:
- _evthr_loop() (droped in this patch)
- evthr_pool_free()
Merge branch 'fix-double-free-for-evthr-v2' into next