[PATCH] gold: --trace: Print to stdout instead of stderr

[Cary Coutant]

>On 2020-06-14, Fangrui Song wrote:
>>GNU ld uses stdout.
>>
>>gold/
>>      * object.cc (Input_objects::add_object): Use puts.

I've filed PR 27615 for this. My only concern is people who have been
using gold and expecting to see the trace output on stderr.

-cary