Fix the Windows header mess
Don't include windows.h and wsockcompat.h from config.h but only when
needed.
Don't define _WINSOCKAPI_ manually. This was apparently done to stop
windows.h from including winsock.h which is a problem if winsock2.h
wasn't included first. But on MinGW, this causes compiler warnings.
Define WIN32_LEAN_AND_MEAN instead which has the same effect.
Always use the compiler-defined _WIN32 macro instead of WIN32.
diff --git a/threads.c b/threads.c
index e52f263..8860697 100644
--- a/threads.c
+++ b/threads.c
@@ -27,6 +27,7 @@
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#elif defined HAVE_WIN32_THREADS
+#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifndef HAVE_COMPILER_TLS
#include <process.h>