zfs: patch client path used in smb share

fix zfs smb share integration

before:

# zfs share tank/smb_share
cannot share tank/smb_share: smb add share failed

now works as intended.

pkgs/os-specific/linux/zfs/default.nix

@@ -6,7 +6,7 @@
 # Userspace dependencies
 , zlib, libuuid, python3, attr, openssl
 , libtirpc
-, nfs-utils
+, nfs-utils, samba
 , gawk, gnugrep, gnused, systemd
 , smartmontools, enableMail ? false
 , sysstat, pkg-config
@@ -55,6 +55,7 @@ let
           # And if it's enabled by default, only change that if we explicitly disable python to remove python from the closure
           nfs-utils.override (old: { enablePython = old.enablePython or true && enablePython; })
         }/bin/exportfs"
+        substituteInPlace ./lib/libshare/smb.h        --replace "/usr/bin/net"            "${samba}/bin/net"
         substituteInPlace ./config/user-systemd.m4    --replace "/usr/lib/modules-load.d" "$out/etc/modules-load.d"
         substituteInPlace ./config/zfs-build.m4       --replace "\$sysconfdir/init.d"     "$out/etc/init.d" \
                                                       --replace "/etc/default"            "$out/etc/default"