[PATCH] Fix 64-bit BFD detection causing build failures

[Maciej W. Rozycki]

On Fri, 14 Feb 2025, Guinevere Larsen wrote:

> As I said in my other email, I'm not confident enough in autotools to properly
> review, but I have tested and it solves the build issue in the mips machine I
> first ran into, so feel free to add my test tag

 Thank you for running this verification.  Please note that I had to post 
v2 now, as I realised a flaw in the use of a cache variable here.  I have 
carried your verification tag across though as the failure scenario is not 
one you tested.

  Maciej