add support for win2k
getaddrinfo() is not available on win2k. By including wspiapi.h (if
_WIN32_WINNT is defined as value < 0x0501) then a compatibility layer
will be used when running on win2k. For more details, refer to Microsoft
docs for getaddrinfo().
#define IS_EINTR( ret ) ( ( ret ) == WSAEINTR )
-#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0501)
-#undef _WIN32_WINNT
+#if !defined(_WIN32_WINNT)
/* Enables getaddrinfo() & Co */
#define _WIN32_WINNT 0x0501
#endif
#include <winsock2.h>
#include <windows.h>
+#if (_WIN32_WINNT < 0x0501)
+#include <wspiapi.h>
+#endif
#if defined(_MSC_VER)
#if defined(_WIN32_WCE)
