Fix compilation using mingw.org's MinGW

[Pedro Alves]

On 4/30/19 7:34 PM, Eli Zaretskii wrote:
>> Cc: lrn1986@gmail.com, gdb-patches@sourceware.org
>> From: Pedro Alves <palves@redhat.com>
>> Date: Tue, 30 Apr 2019 18:58:42 +0100
>>
>> In fact, your patch is doing exactly that.  common-defs.h is garanteed
>> to be included before any started header.  That's exactly why I suggested
>> that spot.
> 
> You were talking about the patch for master, whereas I was talking
> about the patch for the release branch.

Ah, indeed it seemed like we were kind of talking past each other.

Still, my remarks apply likewise (we don't _have_ to define after
the standard headers, before is fine and is the standard practice).
But what I had in the 8.3 patch is fine as is, TBC.

Thanks,
Pedro Alves