Pin coin3d to v4.0.0 until pivy is compatible with v4.0.1.

[oursland]

coin3d recently pushed out a new release, v4.0.1, which does not have some of the symbols that pivy uses. Consequently, this breaks functionality that depends upon `pivy.

Pinning to version 4.0.0 will permit the builds to be successful until pivy is updated for the new coin3d release.

[looooo]

@oursland can you give some insights on this. I tested freecad with coin4.0.1 without recompiling pivy on osx-arm64 and had no issues.

[oursland]

@oursland can you give some insights on this. I tested freecad with coin4.0.1 without recompiling pivy on osx-arm64 and had no issues.

The issue is demonstrated by the automated tests in CI. Here's an example error from CI with coin3d==4.0.1

During CMake configure it will fail to find pivy:

-- Found Coin3D: D:/a/FreeCAD/FreeCAD/.conda/freecad/Library/lib/Coin4.lib  
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\pivy\__init__.py", line 30, in <module>
    from .coin import SoDB, SoNodeKit, SoInteraction
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\pivy\coin.py", line 18, in <module>
    from . import _coin
ImportError: DLL load failed while importing _coin: The specified procedure could not be found.

and

-- pivy:                        -undefined-

However, it will still build just fine.

During automated testing it will error with the following output:

======================================================================
ERROR: TestPathApp (unittest.loader._FailedTest.TestPathApp)
----------------------------------------------------------------------
ImportError: Failed to import test module: TestPathApp
Traceback (most recent call last):
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\unittest\loader.py", line 162, in loadTestsFromName
    module = __import__(module_name)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\build\release\Mod\Path\TestPathApp.py", line 30, in <module>
    from PathTests.TestPathDressupDogbone import TestDressupDogbone
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\build\release\Mod\Path\PathTests\TestPathDressupDogbone.py", line 25, in <module>
    import Path.Dressup.Gui.Dogbone as PathDressupDogbone
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\build\release\Mod\Path\Path\Dressup\Gui\Dogbone.py", line 31, in <module>
    from pivy import coin
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\pivy\__init__.py", line 30, in <module>
    from .coin import SoDB, SoNodeKit, SoInteraction
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\pivy\coin.py", line 18, in <module>
    from . import _coin
  File "D:\a\FreeCAD\FreeCAD\.conda\freecad\Lib\site-packages\shiboken2\files.dir\shibokensupport\feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: DLL load failed while importing _coin: The specified procedure could not be found.

[adrianinsaval]

the latest weekly was built with 4.0.1 and it seems to run fine on linux. I ran the TestPathApp test and it passed without problems. I do see the pivy errors on cmake configure on the build logs however they are also present on the builds with 4.0.0. pivy is a python module so you don't actually need it during build

[adrianinsaval]

at least one user reporting errors: https://forum.freecad.org/viewtopic.php?p=720754#p720754 so I'll merge and we can unpin once pivy gets updated.
coin3d/pivy#108

[looooo]

@adrianinsaval there is a discussion about this here: coin3d/coin#513 Maybe we should set the coin4.0.1 builds to broken on conda-forge.