subr.el (21.5.31) for 21.5.29

[Stephen J. Turnbull]

Aidan Kehoe writes:

 > Given that it Works For You and is the Right Thing, why not commit it? Or at
 > least build a version of the package with that change and point Uwe towards
 > it, to make everyone that bit surer we’re all on the same page.

Well, it's been on my list since the beginning of summer, but Debian
hasn't been cooperating.... :-/

And let's not forget that *Uwe* is maintainer of that package.  The
decision is his, both as maintainer and as the bug reporter.