estat zil script compilation error on 6.1

[brad-lewis]

When running on a 6.1 trunk engine the zil estat script doesn't compile:

$ sudo estat zil 
/virtual/main.c:67:1: error: unknown type name 'uio_t'
uio_t *uio, int ioflag)
^
1 error generated.
Traceback (most recent call last):
  File "/usr/share/performance-diagnostics/bpf/standalone/zil.py", line 260, in <module>
    "-I/usr/src/zfs-" + KVER + "/include/spl"])
  File "/usr/lib/python3/dist-packages/bcc/__init__.py", line 364, in __init__
    raise Exception("Failed to compile BPF module %s" % (src_file or "<text>"))
Exception: Failed to compile BPF module <text>