Lock/unlock files properly for Windows

[PenguinKeeper7]

Implementing a proper fix will allow better feature parity between Linux and Windows and may reduce future bugs. This code is 8 years old and isn't causing any known bugs but would be good practice to fix.
See comments: (fcntl is Linux-only)

hashcat/src/locking.c

Lines 49 to 61 in c1a1051

	int hc_lockfile (MAYBE_UNUSED HCFILE *fp)
	{
	// we should put windows specific code here
	return 0;
	}
	int hc_unlockfile (MAYBE_UNUSED HCFILE *fp)
	{
	// we should put windows specific code here
	return 0;
	}