*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/networking/telnet.c b/networking/telnet.c
index 3a06c16..aaaa264 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -101,7 +101,7 @@
 
 #define write_str(fd, str) write(fd, str, sizeof(str) - 1)
 
-static void doexit(int ev) ATTRIBUTE_NORETURN;
+static void doexit(int ev) NORETURN;
 static void doexit(int ev)
 {
 	cookmode();