*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/coreutils/who.c b/coreutils/who.c
index a206ec5..a4ec740 100644
--- a/coreutils/who.c
+++ b/coreutils/who.c
@@ -41,7 +41,7 @@
 }
 
 int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int who_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int who_main(int argc UNUSED_PARAM, char **argv)
 {
 	char str6[6];
 	struct utmp *ut;