added automatic appveyor build version

Author: megai2

addon/build_version.h

@@ -0,0 +1,2 @@
+#define BUILD_VERSION_NAME "version: unknown" 
+#define BUILD_VERSION_REV 0

addon/d3d9_wrapper.cpp

@@ -1,4 +1,5 @@
 #include "stdafx.h"
+#include "build_version.h"
 
 //gw2addon_get_description
 //gw2addon_load
@@ -21,7 +22,7 @@ gw2al_addon_dsc gAddonDsc = {
 	L"Wrapper for d3d9 API that includes hooking and custom d3d9 loading",
 	1,
 	0,
-	2,
+	BUILD_VERSION_REV,
 	gAddonDeps
 };