autoconf: single-step includes

Still descend, but only once: we get a lot of mileage out of nodist_

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13316

include/Makefile.am

@@ -1,4 +1,10 @@
-SUBDIRS = sys os
+if BUILD_LINUX
+include $(srcdir)/%D%/os/linux/Makefile.am
+endif
+if BUILD_FREEBSD
+include $(srcdir)/%D%/os/freebsd/Makefile.am
+endif
+
 
 COMMON_H = \
 	cityhash.h \
@@ -7,27 +13,187 @@ COMMON_H = \
 	zfs_deleg.h \
 	zfs_fletcher.h \
 	zfs_namecheck.h \
-	zfs_prop.h
+	zfs_prop.h \
+	\
+	sys/abd.h \
+	sys/abd_impl.h \
+	sys/aggsum.h \
+	sys/arc.h \
+	sys/arc_impl.h \
+	sys/avl.h \
+	sys/avl_impl.h \
+	sys/bitops.h \
+	sys/blkptr.h \
+	sys/bplist.h \
+	sys/bpobj.h \
+	sys/bptree.h \
+	sys/bqueue.h \
+	sys/btree.h \
+	sys/dataset_kstats.h \
+	sys/dbuf.h \
+	sys/ddt.h \
+	sys/dmu.h \
+	sys/dmu_impl.h \
+	sys/dmu_objset.h \
+	sys/dmu_recv.h \
+	sys/dmu_redact.h \
+	sys/dmu_send.h \
+	sys/dmu_traverse.h \
+	sys/dmu_tx.h \
+	sys/dmu_zfetch.h \
+	sys/dnode.h \
+	sys/dsl_bookmark.h \
+	sys/dsl_crypt.h \
+	sys/dsl_dataset.h \
+	sys/dsl_deadlist.h \
+	sys/dsl_deleg.h \
+	sys/dsl_destroy.h \
+	sys/dsl_dir.h \
+	sys/dsl_pool.h \
+	sys/dsl_prop.h \
+	sys/dsl_scan.h \
+	sys/dsl_synctask.h \
+	sys/dsl_userhold.h \
+	sys/edonr.h \
+	sys/efi_partition.h \
+	sys/frame.h \
+	sys/hkdf.h \
+	sys/metaslab.h \
+	sys/metaslab_impl.h \
+	sys/mmp.h \
+	sys/mntent.h \
+	sys/mod.h \
+	sys/multilist.h \
+	sys/nvpair.h \
+	sys/nvpair_impl.h \
+	sys/objlist.h \
+	sys/pathname.h \
+	sys/qat.h \
+	sys/range_tree.h \
+	sys/rrwlock.h \
+	sys/sa.h \
+	sys/sa_impl.h \
+	sys/skein.h \
+	sys/spa.h \
+	sys/spa_boot.h \
+	sys/spa_checkpoint.h \
+	sys/spa_checksum.h \
+	sys/spa_impl.h \
+	sys/spa_log_spacemap.h \
+	sys/space_map.h \
+	sys/space_reftree.h \
+	sys/sysevent.h \
+	sys/txg.h \
+	sys/txg_impl.h \
+	sys/u8_textprep.h \
+	sys/u8_textprep_data.h \
+	sys/uberblock.h \
+	sys/uberblock_impl.h \
+	sys/uio_impl.h \
+	sys/unique.h \
+	sys/uuid.h \
+	sys/vdev.h \
+	sys/vdev_disk.h \
+	sys/vdev_draid.h \
+	sys/vdev_file.h \
+	sys/vdev_impl.h \
+	sys/vdev_indirect_births.h \
+	sys/vdev_indirect_mapping.h \
+	sys/vdev_initialize.h \
+	sys/vdev_raidz.h \
+	sys/vdev_raidz_impl.h \
+	sys/vdev_rebuild.h \
+	sys/vdev_removal.h \
+	sys/vdev_trim.h \
+	sys/xvattr.h \
+	sys/zap.h \
+	sys/zap_impl.h \
+	sys/zap_leaf.h \
+	sys/zcp.h \
+	sys/zcp_global.h \
+	sys/zcp_iter.h \
+	sys/zcp_prop.h \
+	sys/zcp_set.h \
+	sys/zfeature.h \
+	sys/zfs_acl.h \
+	sys/zfs_bootenv.h \
+	sys/zfs_context.h \
+	sys/zfs_debug.h \
+	sys/zfs_delay.h \
+	sys/zfs_file.h \
+	sys/zfs_fuid.h \
+	sys/zfs_project.h \
+	sys/zfs_quota.h \
+	sys/zfs_racct.h \
+	sys/zfs_ratelimit.h \
+	sys/zfs_refcount.h \
+	sys/zfs_rlock.h \
+	sys/zfs_sa.h \
+	sys/zfs_stat.h \
+	sys/zfs_sysfs.h \
+	sys/zfs_vfsops.h \
+	sys/zfs_vnops.h \
+	sys/zfs_znode.h \
+	sys/zil.h \
+	sys/zil_impl.h \
+	sys/zio.h \
+	sys/zio_checksum.h \
+	sys/zio_compress.h \
+	sys/zio_crypt.h \
+	sys/zio_impl.h \
+	sys/zio_priority.h \
+	sys/zrlock.h \
+	sys/zthr.h \
+	\
+	sys/crypto/api.h \
+	sys/crypto/common.h \
+	sys/crypto/icp.h \
+	\
+	sys/fm/protocol.h \
+	sys/fm/util.h \
+	sys/fm/fs/zfs.h \
+	\
+	sys/fs/zfs.h \
+	\
+	sys/lua/lauxlib.h \
+	sys/lua/lua.h \
+	sys/lua/luaconf.h \
+	sys/lua/lualib.h \
+	\
+	sys/sysevent/dev.h \
+	sys/sysevent/eventdefs.h \
+	\
+	sys/zstd/zstd.h
+
+
+KERNEL_H = \
+	sys/zfs_ioctl.h \
+	sys/zfs_ioctl_impl.h \
+	sys/zfs_onexit.h \
+	sys/zvol.h \
+	sys/zvol_impl.h
+
 
 USER_H = \
 	libnvpair.h \
-	libuutil_common.h \
 	libuutil.h \
+	libuutil_common.h \
 	libuutil_impl.h \
 	libzfs.h \
-	libzfsbootenv.h \
 	libzfs_core.h \
+	libzfsbootenv.h \
 	libzutil.h \
 	thread_pool.h
 
+
 if CONFIG_USER
 libzfsdir = $(includedir)/libzfs
-libzfs_HEADERS = $(COMMON_H) $(USER_H)
+nobase_libzfs_HEADERS = $(COMMON_H) $(USER_H)
 endif
 
+kerneldir = $(prefix)/src/zfs-$(VERSION)/include
 if CONFIG_KERNEL
 if BUILD_LINUX
-kerneldir = @prefix@/src/zfs-$(VERSION)/include
-kernel_HEADERS = $(COMMON_H)
+nobase_kernel_HEADERS = $(COMMON_H) $(KERNEL_H)
 endif
 endif