build: suppress SPDK_BDEV_NUM_IO_TYPES errors from abidiff

New IO types are just ignored by existing modules, but when
added it changes the value of SPDK_BDEV_NUM_IO_TYPES which
then throws an abidiff error in our build.

So just suppress changes to this specific value so that
adding new IO types doesn't itself result in an SO version
bump.

Thanks Alexey Marchuk for pointing out this abidiff
feature.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ib023bd5ee30a7ebcf7da0bb4b3f8dc54f5713710
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5206
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>

test/make/check_so_deps.sh

@@ -46,6 +46,9 @@ function confirm_abi_deps() {
 	name = spdk_nvme_ctrlr_opts
 [suppress_type]
 	name = spdk_bs_dev
+[suppress_type]
+	type_kind = enum
+	changed_enumerators = SPDK_BDEV_NUM_IO_TYPES
 EOF
 
 	for object in "$libdir"/libspdk_*.so; do