include: add D3D_DRIVER_TYPE to d3dcommon.idl

[Austin English]

-- 
-Austin
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diff --git a/include/d3dcommon.idl b/include/d3dcommon.idl
index 598abd5..76f66f5 100644
--- a/include/d3dcommon.idl
+++ b/include/d3dcommon.idl
@@ -68,6 +68,16 @@ interface ID3DInclude
 
 typedef ID3DInclude* LPD3DINCLUDE;
 
+typedef enum D3D_DRIVER_TYPE
+{
+    D3D_DRIVER_TYPE_UNKNOWN,
+    D3D_DRIVER_TYPE_HARDWARE,
+    D3D_DRIVER_TYPE_REFERENCE,
+    D3D_DRIVER_TYPE_NULL,
+    D3D_DRIVER_TYPE_SOFTWARE,
+    D3D_DRIVER_TYPE_WARP,
+} D3D_DRIVER_TYPE;
+
 typedef enum D3D_FEATURE_LEVEL
 {
     D3D_FEATURE_LEVEL_9_1 = 0x9100,