Removed networkvar and convar patches for sdk2013, as they are no longer needed.

Author: satoon101

src/core/patches/sdk2013/patches.cpp

@@ -23,13 +23,3 @@
 * all respects for all other code used.  Additionally, the Source.Python
 * Development Team grants this exception to all derivative works.
 */
-
-#include "convar.h"
-#ifndef PATCH_CONVAR_H_PUBLIC_FLAGS
-#error "Make ConCommandBase::m_nFlags public."
-#endif
-
-#include "utilities/baseentity.h"
-#ifndef PATCH_NETWORK_HANDLE_BASE_DEFINITION
-#error "We need the CNetworkHandle definition..."
-#endif