Don't import graph under Windows

scripts/wk/hw/cpu.py

@@ -2,6 +2,7 @@
 # vim: sts=2 sw=2 ts=2
 
 import logging
+import platform
 import re
 import subprocess
 
@@ -9,15 +10,17 @@ from typing import TextIO
 
 from wk import exe
 from wk.cfg.hw import CPU_TEMPS
-from wk.graph import (
-  export_cpu_graph,
-  upload_to_imgur,
-  upload_to_nextcloud,
-  )
 from wk.os.mac import set_fans as macos_set_fans
 from wk.std import PLATFORM
 from wk.ui import ansi
 
+if platform.system() != 'Windows':
+  from wk.graph import (
+    export_cpu_graph,
+    upload_to_imgur,
+    upload_to_nextcloud,
+    )
+
 
 # STATIC VARIABLES
 LOG = logging.getLogger(__name__)