quiet a new visual studio compiler complaint from recent code change

..\src\hack.c(2553): warning C4113: 'int (__cdecl *)()' differs in parameter lists from 'int (__cdecl *)(void)'

src/hack.c

@@ -2545,7 +2545,7 @@ pickup_checks()
 
 /* the ',' command */
 int
-dopickup()
+dopickup(VOID_ARGS)
 {
     int count, tmpcount, ret;