[patch rfc]: use xxhash() in ld build-id computation, incl. benchmark

[Nick Clifton]

Hi Frank,

   [Sorry for replying out of thread - I have managed to loose your
   original post somewhere in the bowels of my email client...]

   xxhash looks very nice, so...

> Here's the patch.  Is there interest in me adding xxhash configury and
> formally submitting it?

   Yes please.  Allowing distributions to choose if they want to support
   this hashing method makes sense to me.  So providing them with a
   configure option to do so is, imho, the right way to go.

Cheers
   Nick