*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/shell/cttyhack.c b/shell/cttyhack.c
index bbe5149..0aa4b8a 100644
--- a/shell/cttyhack.c
+++ b/shell/cttyhack.c
@@ -38,7 +38,7 @@
 };
 
 int cttyhack_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int cttyhack_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int cttyhack_main(int argc UNUSED_PARAM, char **argv)
 {
 	int fd;
 	char console[sizeof(int)*3 + 16];