bug#19111: 25.0.50; 32 bits temacs.exe is linked with wrong image-base when built on 64 bit Windows host

[Eli Zaretskii]

> From: Óscar Fuentes <ofv@wanadoo.es>
> Cc: 19111@debbugs.gnu.org
> Date: Wed, 19 Nov 2014 22:50:32 +0100
> 
> Óscar Fuentes <ofv@wanadoo.es> writes:
> 
> > The problem here is that, without explicitly setting --host/--build,
> > uname is not the right thing for detecting the host/build environment,
> > because uname is a MSYS2 thing, when we are building with a MinGW
> > toolset. So either we stop using uname for MinGW builds (use $MSYSTEM),
> > or document that --host/--build are required.
> 
> There other places on `configure' that uses the contents of $canonical
> for deciding if its creating an 32 or 64 bits MinGW build.

I think that's correct.  $canonical should have the right value, as it
does on other platforms.