update make flags used on buildbot

[Sam James]

> On 17 Jan 2023, at 22:31, Mike Frysinger via Binutils <binutils@sourceware.org> wrote:
> 
> not sure where to send this, or where the configs live ...
> 

It's all in https://sourceware.org/git/builder.git builder/master.cfg.

> can someone add the -O option to make ?  it helps greatly when things
> are run in parallel which the builders do as it keeps output from jobs
> from being interleaved.

This should be done already in https://sourceware.org/git?p=builder.git;a=commit;h=05fecee477e44f9d0952a399d344b53400ffb124
and some followups from mjw to handle older make.

Let us know if something more needs doing. I totally agree it's a great QoL improvement.

Best,
sam
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