[Bug 257222] Cannot use libzfs.h from user space programs due to missing libnvpair.h and other dependencies

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257222

--- Comment #3 from Michael Gmelin <grembo@FreeBSD.org> ---
Simple working example:

```
$ cat >test.c <<EOF
#include <sys/stdtypes.h>
#include <libzfs_core.h>

int main(int argc, char** argv)
{
  if (argc != 2) {
    fprintf(stderr, "Invalid arguments\n");
    return 101;
  }

  if (libzfs_core_init() != 0) {
    fprintf(stderr, "Can't init libzfs\n");
    return 101;
  }
  int exists = lzc_exists(argv[1]);
  printf("%s %s\n", argv[1],
    exists ? "exists" : "doesn't exist");
  libzfs_core_fini();
  return exists ? 0 : 1;
}
EOF

$ cc \
    -I/usr/src/sys/contrib/openzfs/include \
    -I/usr/src/sys/contrib/openzfs/lib/libspl/include \
    -lzfs_core -lzfs -o test test.c
$ ./test zroot
zroot exists
```

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