change way of defining WCONST so internal workings aren't as visible in the public API

src/definitions.h

@@ -86,4 +86,5 @@ extern FILE* logtarget[];
 #define absf(x)						((x >= 0) ? (x) : (x * -1.0f))
 #define diff_f(x, y)				((x >= y) ? (absf(x - y)) : (absf(y - x)))
 
+#define WCONST
 #endif // DEFINITIONS_H_INCLUDED

src/wiiuse.h

@@ -70,9 +70,7 @@
 	#include <bluetooth/bluetooth.h>
 #endif
 
-#ifdef WIIUSE_INTERNAL_H_INCLUDED
-	#define WCONST
-#else
+#ifndef WCONST
 	#define WCONST		const
 #endif