Add missing checks for unsupported features

After 35ec517 it has become possible to import ZFS pools witn an
active org.illumos:edonr feature on FreeBSD, leading to a panic.

In addition, "zpool status" reported all pools without edonr
as upgradable and "zpool upgrade -v" reported edonr in the list
of upgradable features.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Martin Matuska <mm@FreeBSD.org>
Closes #11653

lib/libzfs/libzfs_status.c

@@ -482,6 +482,8 @@ check_status(nvlist_t *config, boolean_t isimport,
 			return (ZPOOL_STATUS_COMPATIBILITY_ERR);
 		for (i = 0; i < SPA_FEATURES; i++) {
 			zfeature_info_t *fi = &spa_feature_table[i];
+			if (!fi->fi_zfs_mod_supported)
+				continue;
 			if (pool_features[i] &&
 			    !nvlist_exists(feat, fi->fi_guid))
 				return (ZPOOL_STATUS_FEAT_DISABLED);