[PATCH] lib: work around xapian bug with get_mset(0,0, x)

[Tomi Ollila]

On Fri, Apr 06 2018, David Bremner wrote:

> At least Fedora28 triggers this Xapian bug due to some toolchain change .
>
>    https://bugzilla.redhat.com/show_bug.cgi?id=1546162
>
> The underlying bug is fixed in xapian commit f92e2a936c1592, and
> should be fixed in Xapian 1.4.6
> ---
>
> I have verified this doesn't break the test suite in my environment,
> but I would appreciate feedback from someone with a Fedora 28 test
> platform.

Without this change, on Fedora 28 container:

9 aborts.
test execution halts at T570-revision-tracking.2 since ${result} 
is empty string

with this change: failure count is about the same as with fedora 27

so, +1

That, is my setup, pulled fedora:28 docker image and run a script
to install some stuff there. I'd bet I can get the error count
down by tuning the creation script...

Tomi