bogus FAILs from mmix ld testsuite

[Hans-Peter Nilsson]

On Mon, 24 Nov 2025, Alan Modra wrote:

> Get rid of [^c][^h][^i][^l][^d] from error regex.  It won't match
> /home/... and other legitimate paths printed for the program name of
> the ld under test.
> 
> 	* testsuite/ld-mmix/bpo-15.d: Fix error regex.
> 	* testsuite/ld-mmix/bpo-15m.d: Likewise.
> 	* testsuite/ld-mmix/bpo-21.d: Likewise.
> 	* testsuite/ld-mmix/bpo-21m.d: Likewise.

Oh I was supposed to look at this... Until the, I remember I did 
that to *not* match a SEGV that happened just after the output, 
but I yet haven't dug deeper.  I intend to fix it though, and 
not by just removing the "offending" part.

brgds, H-P