Add no-op for FileLock on Web Assembly Platform

[michaelweinold]

Would it be possible to add a no-op for the FileLock variable on the Web Assembly platform here:

if os.name == "nt":
    FileLock = MsvcrtLock
else:
    FileLock = FcntlLock

Otherwise, using whoosh in Pyodide will throw an error of the kind:

File /lib/python3.11/site-packages/whoosh/util/filelock.py:100, in FcntlLock.acquire(self, blocking)
     97 flags = os.O_CREAT | os.O_WRONLY
     98 self.fd = os.open(self.filename, flags)
--> 100 mode = fcntl.LOCK_EX
    101 if not blocking:
    102     mode |= fcntl.LOCK_NB

AttributeError: module 'fcntl' has no attribute 'LOCK_EX'

This was suggested here:

• https://github.com/pyodide/pyodide/discussions/4150

and is related to:

• https://github.com/brightway-lca/brightway-live/issues/49

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