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

[Daniel Kahn Gillmor]

On Fri 2018-04-06 08:43:07 -0300, 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

is there any way that we can apply this change only if we detect that
we're running with an unfixed version of Xapian?

      --dkg