fixup! validation: Use prove(1) as a TAP harness

Author: wking

README.md

@@ -36,7 +36,7 @@ If you cannot install `prove`, you can probably run the test suite with another
 ```console
 $ make runtimetest validation-executables
 $ sudo make RUNTIME=runc localvalidation
-RUNTIME=/home/wking/bin/runc prove validation/linux_rootfs_propagation_shared.t validation/create.t validation/default.t validation/linux_readonly_paths.t validation/linux_masked_paths.t validation/mounts.t validation/process.t validation/root_readonly_false.t validation/linux_sysctl.t validation/linux_devices.t validation/linux_gid_mappings.t validation/process_oom_score_adj.t validation/process_capabilities.t validation/process_rlimits.t validation/root_readonly_true.t validation/linux_rootfs_propagation_unbindable.t validation/hostname.t validation/linux_uid_mappings.t
+RUNTIME=runc prove validation/linux_rootfs_propagation_shared.t validation/create.t validation/default.t validation/linux_readonly_paths.t validation/linux_masked_paths.t validation/mounts.t validation/process.t validation/root_readonly_false.t validation/linux_sysctl.t validation/linux_devices.t validation/linux_gid_mappings.t validation/process_oom_score_adj.t validation/process_capabilities.t validation/process_rlimits.t validation/root_readonly_true.t validation/linux_rootfs_propagation_unbindable.t validation/hostname.t validation/linux_uid_mappings.t
 validation/linux_rootfs_propagation_shared.t ...... Failed 1/19 subtests
 validation/create.t ............................... ok
 validation/default.t .............................. ok