include/linux/linkage.h: remove unused ATTRIB_NORET macro

The uses have been renamed so delete the unused macro.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/linkage.h

@@ -88,6 +88,4 @@
 
 #endif
 
-#define ATTRIB_NORET  __attribute__((noreturn))
-
 #endif