patch rfc - valgrind vs. debuginfod

[Frank Ch. Eigler]

Hi -

> On irc we discussed some issues with trying to disable debuginfod
> client for valgrind while actually using it in the to be tested
> executable. The main issue is that valgrind and the test executable are
> actually one and the same. So disabling or enabling DEBUGINFOD_URLS for
> one also disables or enables it for the other.

Yeah, it makes sense to disable this testing.  You're doing it late
enough that -some- valgrinding will still happen, so lgtm.

- FChE