zdb: replace label_t to zdb_zdb_label_t for reduce collisions

with builds on illumos based platform we can see build issue
because label_t has been redefined.

for reduce build issues on others platforms we should rename
label_t to zdb_label_t.

Signed-off-by: Igor Kozhukhov <igor@dilos.org>

cmd/zdb/zdb.c

@@ -2855,17 +2855,17 @@ print_label_numbers(char *prefix, cksum_record_t *rec)

#define	MAX_UBERBLOCK_COUNT (VDEV_UBERBLOCK_RING >> UBERBLOCK_SHIFT)

typedef struct label {
typedef struct zdb_label {
	vdev_label_t label;
	nvlist_t *config_nv;
	cksum_record_t *config;
	cksum_record_t *uberblocks[MAX_UBERBLOCK_COUNT];
	boolean_t header_printed;
	boolean_t read_failed;
} label_t;
} zdb_label_t;

static void
print_label_header(label_t *label, int l)
print_label_header(zdb_label_t *label, int l)
{

	if (dump_opt['q'])
@@ -2882,7 +2882,7 @@ print_label_header(label_t *label, int l)
}

static void
dump_config_from_label(label_t *label, size_t buflen, int l)
dump_config_from_label(zdb_label_t *label, size_t buflen, int l)
{
	if (dump_opt['q'])
		return;
@@ -2901,7 +2901,7 @@ dump_config_from_label(label_t *label, size_t buflen, int l)
#define	ZDB_MAX_UB_HEADER_SIZE 32

static void
dump_label_uberblocks(label_t *label, uint64_t ashift, int label_num)
dump_label_uberblocks(zdb_label_t *label, uint64_t ashift, int label_num)
{

	vdev_t vd;
@@ -3045,7 +3045,7 @@ static int
dump_label(const char *dev)
{
	char path[MAXPATHLEN];
	label_t labels[VDEV_LABELS];
	zdb_label_t labels[VDEV_LABELS];
	uint64_t psize, ashift;
	struct stat64 statbuf;
	boolean_t config_found = B_FALSE;
@@ -3110,7 +3110,7 @@ dump_label(const char *dev)
	 * 3. Traverse all uberblocks and insert in uberblock tree.
	 */
	for (int l = 0; l < VDEV_LABELS; l++) {
		label_t *label = &labels[l];
		zdb_label_t *label = &labels[l];
		char *buf = label->label.vl_vdev_phys.vp_nvlist;
		size_t buflen = sizeof (label->label.vl_vdev_phys.vp_nvlist);
		nvlist_t *config;
@@ -3173,7 +3173,7 @@ dump_label(const char *dev)
	 * Dump the label and uberblocks.
	 */
	for (int l = 0; l < VDEV_LABELS; l++) {
		label_t *label = &labels[l];
		zdb_label_t *label = &labels[l];
		size_t buflen = sizeof (label->label.vl_vdev_phys.vp_nvlist);

		if (label->read_failed == B_TRUE)