Changed the type of Function to PDWORD as on Windows.

diff --git a/include/winnt.h b/include/winnt.h
index 9b460ad..4255285 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -1958,7 +1958,7 @@
 typedef struct _IMAGE_THUNK_DATA {
 	union {
 		LPBYTE    ForwarderString;
-		FARPROC Function;
+		PDWORD    Function;
 		DWORD     Ordinal;
 		PIMAGE_IMPORT_BY_NAME	AddressOfData;
 	} u1;