include: Change twain.h to use LONG/ULONG for Win64 compatibility.
Also fix the compiler warnings introduced by this change.
diff --git a/include/twain.h b/include/twain.h
index 13bc406..a7ff0f0 100644
--- a/include/twain.h
+++ b/include/twain.h
@@ -127,10 +127,10 @@
/* Numeric types. */
typedef char TW_INT8, FAR *pTW_INT8;
typedef short TW_INT16, FAR *pTW_INT16;
-typedef long TW_INT32, FAR *pTW_INT32;
+typedef LONG TW_INT32, FAR *pTW_INT32;
typedef unsigned char TW_UINT8, FAR *pTW_UINT8;
typedef unsigned short TW_UINT16, FAR *pTW_UINT16;
-typedef unsigned long TW_UINT32, FAR *pTW_UINT32;
+typedef ULONG TW_UINT32, FAR *pTW_UINT32;
typedef unsigned short TW_BOOL, FAR *pTW_BOOL;
/* Fixed point structure type. */
