[nrf noup] Fix generate zap sript on windows

Usage of generate.py script is not possible on windows
due to fcntl package available onlu on unix pyhton packages
using I/O control on descriptor file is not needed on windows.
This change enhance script to use fcntl on non-window system.

scripts/tools/zap/generate.py

@@ -16,7 +16,7 @@
 #
 
 import argparse
-import fcntl
+import platform
 import json
 import os
 import shutil
@@ -30,6 +30,13 @@
 
 from zap_execution import ZapTool
 
+def isWindows():
+    return platform.system() == "Windows"
+
+# fcntl is not supported on widows platfrom due to lack of necessity of I/O control on file descriptor
+if not isWindows():
+    import fcntl
+
 
 @dataclass
 class CmdLineArgs:
@@ -287,16 +294,17 @@ def __init__(self, path):
         self.lock_file = None
 
     def __enter__(self):
-        if not self.lock_file_path:
+        # fcntl is not supported on widows platfrom due to lack of necessity of I/O control on file descriptor
+        if not self.lock_file_path or isWindows():
             return
-
         self.lock_file = open(self.lock_file_path, 'wb')
         fcntl.lockf(self.lock_file, fcntl.LOCK_EX)
 
+
     def __exit__(self, *args):
-        if not self.lock_file:
+        # fcntl is not supported on widows platfrom due to lack of necessity of I/O control on file descriptor
+        if not self.lock_file or isWindows():
             return
-
         fcntl.lockf(self.lock_file, fcntl.LOCK_UN)
         self.lock_file.close()
         self.lock_file = None