zfs: merge openzfs/zfs@229b9f4ed

Notable upstream pull request merges:
 #15769 082338875 Add 'zpool status -e' flag to see unhealthy vdevs
 #15804 a0d3fe72b libzdb: Initial breakout of libzdb
 #15847 229b9f4ed LUA: Backport CVE-2020-24370's patch

Obtained from:	OpenZFS
OpenZFS commit:	229b9f4ed0

share/mk/bsd.libnames.mk

@@ -167,6 +167,7 @@ LIBXPG4?=	${LIBDESTDIR}${LIBDIR_BASE}/libxpg4.a
 LIBY?=		${LIBDESTDIR}${LIBDIR_BASE}/liby.a
 LIBYPCLNT?=	${LIBDESTDIR}${LIBDIR_BASE}/libypclnt.a
 LIBZ?=		${LIBDESTDIR}${LIBDIR_BASE}/libz.a
+LIBZDB?=	${LIBDESTDIR}${LIBDIR_BASE}/libzdb.a
 LIBZFS?=	${LIBDESTDIR}${LIBDIR_BASE}/libzfs.a
 LIBZFS_CORE?=	${LIBDESTDIR}${LIBDIR_BASE}/libzfs_core.a
 LIBZFSBOOTENV?=	${LIBDESTDIR}${LIBDIR_BASE}/libzfsbootenv.a

share/mk/src.libnames.mk

@@ -223,6 +223,7 @@ _LIBRARIES=	\
 		y \
 		ypclnt \
 		z \
+		zdb \
 		zfs_core \
 		zfs \
 		zfsbootenv \
@@ -683,6 +684,8 @@ LIBNVPAIRDIR=	${_LIB_OBJTOP}/cddl/lib/libnvpair
 LIBNVPAIR?=	${LIBNVPAIRDIR}/libnvpair${PIE_SUFFIX}.a
 LIBUMEMDIR=	${_LIB_OBJTOP}/cddl/lib/libumem
 LIBUUTILDIR=	${_LIB_OBJTOP}/cddl/lib/libuutil
+LIBZDBDIR=	${_LIB_OBJTOP}/cddl/lib/libzdb
+LIBZDB?=	${LIBZDBDIR}/libzdb${PIE_SUFFIX}.a
 LIBZFSDIR=	${_LIB_OBJTOP}/cddl/lib/libzfs
 LIBZFS?=	${LIBZFSDIR}/libzfs${PIE_SUFFIX}.a
 LIBZFS_COREDIR=	${_LIB_OBJTOP}/cddl/lib/libzfs_core