*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/coreutils/printf.c b/coreutils/printf.c
index b775236..a14306f 100644
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -279,7 +279,7 @@
 	return argv;
 }
 
-int printf_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int printf_main(int argc UNUSED_PARAM, char **argv)
 {
 	char *format;
 	char **argv2;