[PATCH] util/attr.h: use HAVE___ATTRIBUTE__, not __GNUC__ comparisons

[Douglas Bagnall]

Version 2, with additions.
 
>  #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
>  #define _NORETURN_ __attribute__ ((noreturn))
>  #else
>  #define _NORETURN_
>  #endif
> 
> which would have done the wrong thing for 4.0. With version 5, GCC
> switched to 1-based minor versions, but as gcc-6 has not been
> released, I still have a minor version of zero.

The first time I had "#if HAVE___ATTRIBUTE__" instead of
"#ifdef HAVE___ATTRIBUTE__". Oops.

This also has patches for a few other places doing the same kind of
thing. There are some interesting variations that might need a close
look.

Andrew has RB+ed the first one.

Douglas
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