[Bug 289655] Add /usr/include/openzfs to support in-base and external applications

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289655

--- Comment #2 from crest@rlwinm.de ---
Just the Makefile:

```
PROG=                   libzfs_demo
MAN=
SRCS=                   main.c

CFLAGS+=                -O0 -g -pipe -DRACONIC

ZFS_INCDIRS+=           contrib/openzfs/include
ZFS_INCDIRS+=           contrib/openzfs/lib/libspl/include/
ZFS_INCDIRS+=           contrib/openzfs/lib/libspl/include/os/freebsd
ZFS_INCDIRS+=           contrib/cddl/compat/opensolaris/include
ZFS_INCDIRS+=           contrib/openzfs/module/icp/include
.for zfs_incdir in ${ZFS_INCDIRS}
CFLAGS+=                -I$(.CURDIR)/$(zfs_incdir)
.endfor
LDFLAGS+=               -lzfs

.include <bsd.prog.mk>
```

The main.c:

```
#include <sys/dtrace.h>
#include <vm/vm.h>
typedef long long hrtime_t;
#include <libzfs_core.h>
#include <libzfs.h>

#include <err.h>
#include <errno.h>

static libzfs_handle_t *lib_handle = NULL;

static void
close_libzfs(void)
{
        if (lib_handle != NULL) {
                libzfs_fini(lib_handle);
        }
}

static libzfs_handle_t *
open_libzfs(void)
{
        if (lib_handle != NULL) {
                return lib_handle;
        }

        lib_handle = libzfs_init();
        if (lib_handle == NULL) {
                errx(1, "%s:%d %s(): Failed to init libzfs: %s", __FILE__,
__LINE__, __func__, libzfs_error_init(errno));
        }

        if (atexit(close_libzfs) != 0) {
                err(1, "%s:%d %s(): Failed to register atexit handler",
__FILE__, __LINE__, __func__);
        }

        return lib_handle;
}

int
main(int argc, char **argv)
{
        libzfs_handle_t *lib = open_libzfs();
        for (int i = 1; i < argc; i++) {
                const char *name = argv[i];
                boolean_t exists = zfs_dataset_exists(lib, name,
ZFS_TYPE_FILESYSTEM);
                printf("name = %s, exists = %s\n", name, exists ? "true" :
"false");
        }
        return 0;
}
```

To make it work I copied the following files into the contrib directory:

 - contrib/openzfs/include/sys/avl.h
 - contrib/openzfs/include/sys/avl_impl.h
 - contrib/openzfs/include/sys/fs/zfs.h
 - contrib/openzfs/include/sys/zio_priority.h
 - contrib/openzfs/lib/libspl/include/libshare.h
 - contrib/openzfs/lib/libspl/include/os/freebsd/sys/mnttab.h

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