Explicitly cast function pointer to (void *) in SET_WCB since all callbacks stored as void pointers

suppress gcc -Wall -pendantic "noise"


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@432 7f0cb862-5218-0410-a997-914c9d46530a

freeglut/freeglut/src/freeglut_internal.h

@@ -396,7 +396,7 @@ struct tagSFG_WindowState
 do                                                             \
 {                                                              \
     if( FETCH_WCB( window, cbname ) != func )                  \
-        (((window).CallBacks[CB_ ## cbname]) = func); \
+        (((window).CallBacks[CB_ ## cbname]) = (void *) func); \
 } while( 0 )                                                   \
 
 /*