Fix antlib location in bundled pyinstaller executable

[bjorgan]

Using dfu ant from the standalone pyinstaller executable (e.g. https://github.com/NordicSemiconductor/pc-nrfutil/releases/download/v6.1.2/nrfutil.exe) yields the following error:

$ ./nrfutil.exe dfu ant --package dfu.zip
Traceback (most recent call last):
  File "PyInstaller\loader\pyimod04_ctypes.py", line 53, in __init__
  File "ctypes\__init__.py", line 374, in __init__
FileNotFoundError: Could not find module 'C:\Users\[user]\AppData\Local\Temp\_MEI125402\antlib\win32\ANT_WrappedLib.dll' (or one of its dependencies). Try using the full path with constructor syntax.

The antlib DLL is assumed to be located at antlib/win32/ANT_WrappedLib.dll within the unpacked bundle, but actual location in the bundle is win32/ANT_WrappedLib.dll. This fix should rectify the bundled location.

[jornbh]

👍. Well spotted. I can not say anything about the correctness of this, since I don't know enough about it :/

[jornbh]

This solved the issue related to the DLL, but there still seem to be issues with the ant command in the executable.