With kernel 6.11.0 this test suddenly started to work, as if the minix
filesystem in this kernel suddenly supports trimming. I checked the
kernel source and I can't find anything relevant so I'm not sure what
happened. In any case this test is of very marginal utility so just
delete it.
Gbp-Pq: Name sparsify-Remove-test-virt-sparsify-in-place-fstrim-unsupp.patch