Fix imports under Windows

scripts/wk/__init__.py

@@ -1,24 +1,27 @@
 """WizardKit: wk module init"""
 # vim: sts=2 sw=2 ts=2
 
+import platform
 from sys import version_info as version
 
 from wk import cfg
 from wk import debug
 from wk import exe
-from wk import graph
 from wk import hw
 from wk import io
 from wk import kit
 from wk import log
 from wk import net
 from wk import os
-from wk import osticket
 from wk import repairs
 from wk import std
 from wk import sw
 from wk import tmux
 
+if platform.system() != 'Windows':
+  from wk import graph
+  from wk import osticket
+
 
 # Check env
 if version < (3, 7):

scripts/wk/hw/__init__.py

@@ -1,6 +1,10 @@
 """WizardKit: hw module init"""
 
-from wk.hw import ddrescue
-from wk.hw import diags
+import platform
+
 from wk.hw import obj
 from wk.hw import sensors
+
+if platform.system() != 'Windows':
+  from wk.hw import ddrescue
+  from wk.hw import diags