[PATCH] PR libstdc++/80446 cope with libc defining __has_builtin

[Jonathan Wakely]

On 19/04/17 11:49 +0100, Jonathan Wakely wrote:
>Both newlib and FreeBSD have this in libc headers:
>
>#ifndef __has_builtin
>#define __has_builtin(x) 0
>#endif
>
>This means our attempts to use #ifdef __has_builtin aren't reliable,
>so we need a different approach. With this patch we don't care whether
>it's defined or not, only its value.
>
>	PR libstdc++/80446
>	* include/std/type_traits (is_aggregate): Change __has_builtin checks.
>	* libsupc++/new (launder): Likewise.
>
>Tested ppc64le-linux and x86_64-freebsd11.0, committed to trunk.

Jakub pointed out I forgot to update the macro name in a comment.

Smoke-tested and committed to trunk.

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