windows: fix fcntl import (#2329)

* windows: fix fcntl import

* fix indentation

* add windows ci

* make sure CI catches import error

* Revert "make sure CI catches import error"

This reverts commit b18043ac76.

python/spi.py

@@ -1,6 +1,5 @@
 import binascii
 import os
-import fcntl
 import math
 import time
 import struct
@@ -12,6 +11,13 @@ from .base import BaseHandle, BaseSTBootloaderHandle, TIMEOUT
 from .constants import McuType, MCU_TYPE_BY_IDCODE, USBPACKET_MAX_SIZE
 from .utils import logger
 
+# No fcntl on Windows
+try:
+  import fcntl
+except ImportError:
+  fcntl = None # type: ignore
+
+# No spidev on MacOS/Windows
 try:
   import spidev
 except ImportError: