Prefer _Noreturn to __attribute__ ((__noreturn__)) when either will do

[Paul Eggert]

Joseph Myers wrote:
> You can of course propose
> (with corresponding patch) a change to the style used

Fair enough. (That's what I get for suggesting an improvement.... :-) Proposed 
patch attached.

> (recalling that for
> installed headers _Noreturn would reduce portability because of prefix
> attributes not working with GCC 2.7),

The attached patch shouldn't reduce portability to GCC 2.7 or earlier, because 
cdefs.h defines _Noreturn to nothing for these ancient compilers, which merely 
means they may miss some minor opportunities for optimization when compiling 
user code.
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