*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 0017a4b..eb98f1c 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -738,7 +738,7 @@
 #if ENABLE_BUILD_LIBBUSYBOX
 int lbb_main(char **argv)
 #else
-int main(int argc ATTRIBUTE_UNUSED, char **argv)
+int main(int argc UNUSED_PARAM, char **argv)
 #endif
 {
 #if defined(SINGLE_APPLET_MAIN)