Bug#886251: librsvg: should have autopkgtests

[Simon McVittie]

Source: librsvg
Version: 2.40.20-2
Severity: wishlist

librsvg has build-time tests, but some of them are skipped to make
#884849 and #884850 not be release-critical.

As-installed testing would be useful to have, and in particular
autopkgtest failures do not have to be automatically release-critical.
librsvg already has GNOME installed-tests, which are usually easy to
turn into autopkgtests.

This would require an upstreamable patch to fix the embedded path of
the build directory, as I mentioned in #886239.

    smcv