Fix C4430 warning in avshws.h

Author: winstliu

avstream/avshws/avshws.h

@@ -56,7 +56,7 @@ extern "C" {
 #define DEBUGLVL_TERSE 1
 #define DEBUGLVL_ERROR 0
 
-const DebugLevel = DEBUGLVL_TERSE;
+const int DebugLevel = DEBUGLVL_TERSE;
 
 #if (DBG)
 #define _DbgPrintF(lvl, strings) \
@@ -365,4 +365,4 @@ void __cdecl operator delete[]
 #include "filter.h"
 #include "capture.h"
 #include <uuids.h>
-#endif //_avshws_h_
+#endif //_avshws_h_