Add extras/include dir for putting an mfc header that was yanked from a Windows SDK 7.1 sample

makepanda/makepanda.py

@@ -476,6 +476,7 @@ if (COMPILER == "MSVC"):
                 LibName(pkg, 'dxerrVNUM.lib'.replace("VNUM", vnum))
             LibName(pkg, 'ddraw.lib')
             LibName(pkg, 'dxguid.lib')
+    IncDirectory("MFC", GetThirdpartyDir() + "extras/include")
     LibName("WINSOCK", "wsock32.lib")
     LibName("WINSOCK2", "wsock32.lib")
     LibName("WINSOCK2", "ws2_32.lib")