Added new include file ws2spi.h for adding needed types.
diff --git a/include/ws2spi.h b/include/ws2spi.h
new file mode 100644
index 0000000..7178cf6
--- /dev/null
+++ b/include/ws2spi.h
@@ -0,0 +1,24 @@
+/* WS2SPI.H -- definitions to be used with the WinSock service provider. */
+
+#ifndef _WINSOCK2SPI_
+#define _WINSOCK2SPI_
+
+#ifndef _WINSOCK2API_
+#include "winsock2.h"
+#endif /* !defined(_WINSOCK2API_) */
+
+#include "pshpack4.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* defined(__cplusplus) */
+
+typedef BOOL WINAPI (*LPWPUPOSTMESSAGE)(HWND,UINT,WPARAM,LPARAM);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif /* defined(__cplusplus) */
+
+#include "poppack.h"
+
+#endif /* !defined(_WINSOCK2SPI_) */
