libspl/include: remove unused/empty headers

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13447

lib/libspl/include/sys/kstat.h

@@ -92,39 +92,6 @@ typedef struct kstat {
 	void		*ks_lock;	/* protects this kstat's data */
 } kstat_t;
 
-#ifdef _SYSCALL32
-
-typedef int32_t kid32_t;
-
-typedef struct kstat32 {
-	/*
-	 * Fields relevant to both kernel and user
-	 */
-	hrtime_t	ks_crtime;
-	caddr32_t	ks_next;		/* struct kstat pointer */
-	kid32_t		ks_kid;
-	char		ks_module[KSTAT_STRLEN];
-	uint8_t		ks_resv;
-	int32_t		ks_instance;
-	char		ks_name[KSTAT_STRLEN];
-	uint8_t		ks_type;
-	char		ks_class[KSTAT_STRLEN];
-	uint8_t		ks_flags;
-	caddr32_t	ks_data;		/* type-specific data */
-	uint32_t	ks_ndata;
-	size32_t	ks_data_size;
-	hrtime_t	ks_snaptime;
-	/*
-	 * Fields relevant to kernel only (only needed here for padding)
-	 */
-	int32_t		_ks_update;
-	caddr32_t	_ks_private;
-	int32_t		_ks_snapshot;
-	caddr32_t	_ks_lock;
-} kstat32_t;
-
-#endif	/* _SYSCALL32 */
-
 /*
  * kstat structure and locking strategy
  *
@@ -467,7 +434,7 @@ typedef struct kstat_named {
  * 64-bit compilation environments or 32-bit non-maximally conformant
  * C89 or C90 ANSI C compilation environments (cc -Xt and cc -Xa). In the
  * C99 ANSI C compilation environment, the long long type is supported.
- * The _INT64_TYPE is defined by the implementation (see sys/int_types.h).
+ * The _INT64_TYPE is defined by the implementation (see sys/inttypes.h).
  */
 #if defined(_INT64_TYPE)
 		int64_t		i64;