include: Define IUnknown.

include/unknown.idl

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016 Józef Kucia for CodeWeavers
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+cpp_quote("#ifndef __VKD3D_UNKNOWN_H")
+cpp_quote("#define __VKD3D_UNKNOWN_H")
+
+/* For IDL only. */
+cpp_quote("#if 0")
+typedef IID *REFIID;
+typedef IID *REFGUID;
+cpp_quote("#endif")
+
+cpp_quote("#if !defined(_WIN32)")
+typedef struct LUID
+{
+    DWORD LowPart;
+    LONG HighPart;
+} LUID;
+
+typedef struct _RECT
+{
+    LONG left;
+    LONG top;
+    LONG right;
+    LONG bottom;
+} RECT;
+cpp_quote("#endif")
+
+[uuid(00000000-0000-0000-C000-000000000046), object, local, pointer_default(unique)]
+interface IUnknown
+{
+    HRESULT QueryInterface(REFIID riid, void **object);
+    ULONG AddRef();
+    ULONG Release();
+};
+
+cpp_quote("#endif   /* __VKD3D_UNKNOWN_H */")