Fixed unused variable warnings in free_stat_x.

ifuncs.h

@@ -89,13 +89,18 @@ init_stat_x(stat_x *sx_p)
 static inline void
 free_stat_x(stat_x *sx_p)
 {
-	extern int preserve_acls, preserve_xattrs;
 #ifdef SUPPORT_ACLS
+    {
+	extern int preserve_acls;
 	if (preserve_acls)
 		free_acl(sx_p);
+    }
 #endif
 #ifdef SUPPORT_XATTRS
+    {
+	extern int preserve_xattrs;
 	if (preserve_xattrs)
 		free_xattr(sx_p);
+    }
 #endif
 }