powerpc switched back to GCC 8

To: port-macppc%netbsd.org@localhost, port-powerpc%netbsd.org@localhost
Subject: powerpc switched back to GCC 8
From: Valery Ushakov <uwe%stderr.spb.ru@localhost>
Date: Thu, 23 Jan 2020 00:55:05 +0300

On Wed, Jan 22, 2020 at 16:04:46 +0300, Valery Ushakov wrote:

> GCC 8 on powerpc has broken alloca() - http://gnats.netbsd.org/54827
> 
> As there's no fix yet (there's a kludge, but I'm not happy with it) I
> have reverted powerpc to GCC 7 for now.  Ok mrg@.

There's no better way to find a fix for some piece of code than to
disable it...

I believe GCC 8 alloca() is now properly fixed.  Details in the PR.
I have switched powerpc ports back to GCC 8. Ok mrg@.

-uwe

References:
- HEADS UP: macppc gcc8 fallout in -current
  - From: Valery Ushakov
- powerpc reverted to GCC 7
  - From: Valery Ushakov

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