[Libguestfs] [PATCH libnbd] tests: Use libc_malloc_debug.so.0 instead of MALLOC_CHECK_ for glibc 2.34

[Richard W.M. Jones]

I pushed this which fixes everything:

https://gitlab.com/nbdkit/libnbd/-/commit/45e329178c41c3cea61b879b08ba0884a6ac514c

However I think we should in the long term find a way to unset
GLIBC_TUNABLES when running under valgrind.  (I couldn't work out how
to use env -u).  Anyway that's for another day.

Also:
https://bugzilla.redhat.com/show_bug.cgi?id=1985048#c4

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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