[BUG] On Windows, liboslquery will have errors on import with invalid PATH variables

[Alaska-001]

Describe the bug

When running import oslquery in Python, and you have a invalid path like C: in your environment variables, you will get a error.

To Reproduce

On Windows:

• Add C: to PATH
  • Important, it needs to be C: and not C:\
• Run a Python script that imports liboslquery. The simplest way is to just run https://github.com/AcademySoftwareFoundation/OpenShadingLanguage/blob/main/src/liboslquery/__init__.py directly.
• Notice you get a error message

Evidence

Error message:

Traceback (most recent call last):
  File "/path/to/oslquery/__init__.py", line 10, in <module>
    os.add_dll_directory(path)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "<frozen os>", line 1165, in add_dll_directory
OSError: [WinError 87] The parameter is incorrect: 'C:'
```