[PING^5][PATCH v2] Fix 64-bit BFD detection causing build failures

[Maciej W. Rozycki]

On Wed, 23 Apr 2025, Luis Machado wrote:

> > I'll take a look at this and give this a go on my end. Sorry for the delay.
> 
> I did some testing on my end and this works for me. And the change to gdb's
> configure is fairly simple too.

 I've committed the change now that I'm back from holiday, having resolved 
a merge conflict in gdb/configure and verified the directory still builds 
afterwards (for `mips-linux-gnu' target).  Thank you for your review.

  Maciej