libzpool: remove global libzpool includes

Only include the zfs headers where they're currently required to
compile.  Unfortunately, including zfs_ioctl.h in user space pulls
in a bunch of internal zfs headers as a side effect.  We'll need
to move these structures in to a new shared header to avoid this.
We should not need to add the LIBZPOOL_CPPFLAGS when building the
zed, zinject, zpool, libzfs, ior libzfs_core.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17861

tests/zfs-tests/cmd/Makefile.am

@@ -60,7 +60,6 @@ scripts_zfs_tests_bin_PROGRAMS += %D%/file_append %D%/file_check %D%/file_trunc
 
 
 scripts_zfs_tests_bin_PROGRAMS += %D%/libzfs_input_check
-%C%_libzfs_input_check_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)/include/os/@ac_system_l@/zfs
 %C%_libzfs_input_check_LDADD = \
 	libzfs_core.la \
 	libnvpair.la

tests/zfs-tests/cmd/ereports.c

@@ -22,11 +22,12 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <libzfs.h>
-#include <sys/zfs_ioctl.h>
 #include <sys/nvpair.h>
 #include <sys/fm/protocol.h>
 #include <sys/fm/fs/zfs.h>
 
+#define	ZEVENT_NONBLOCK	0x1
+
 /*
  * Command to output io and checksum ereport values, one per line.
  * Used by zpool_events_duplicates.ksh to check for duplicate events.