If we were to move to meson, the whole test suite would be available in the dist, so make sure this doesn't balloon the size of the tarball.
Size reduction executed with: for i in * ; do SIZE=$(stat --printf="%s" $i) ; if [ $SIZE -gt 131072 ] ; then dd if=$i of=$i.tmp bs=128k count=1 && mv $i.tmp $i ; fi ; done