Fix BFD format matching for x86_64-w64-mingw32 -m32 LTO

[Joseph Myers]

On Mon, 15 Feb 2016, H.J. Lu wrote:

> Would you mind giving users/hjl/lto-mixed/master branch a try? It
> may have fixed your problem in a different way by adding

That branch does not fix my problem; I see the

/tmp/ccyW7MUw.o: file not recognized: File format is ambiguous
/tmp/ccyW7MUw.o: matching formats: pe-i386 pei-i386
collect2: error: ld returned 1 exit status

errors there.

-- 
Joseph S. Myers
joseph@codesourcery.com