Fix mypy problem on Windows due to platform differences

As reported in <https://github.com/pymc-devs/pytensor/pull/678#issuecomment-2036674730>, mypy was failing on Windows due to an unnecessary type: ignore. This fixes it by ignoring the unused-ignore so that Windows is covered.

Fix mypy problem on Windows due to platform differences
0a13fbd6 · Ben Mares · Ricardo Vieira · bc3dda0e · 0a13fbd6
--- a/pytensor/link/c/cmodule.py
+++ b/pytensor/link/c/cmodule.py
@@ -284,7 +284,11 @@ def add_gcc_dll_directory() -> None:
    if (sys.platform == "win32") & (hasattr(os, "add_dll_directory")):
        gcc_path = shutil.which("gcc")
        if gcc_path is not None:
-            os.add_dll_directory(os.path.dirname(gcc_path))  # type: ignore
+            # Since add_dll_directory is only defined on windows, we need
+            # the ignore[attr-defined] on non-Windows platforms.
+            # For Windows we need ignore[unused-ignore] since the ignore
+            # is unnecessary with that platform.
+            os.add_dll_directory(os.path.dirname(gcc_path))  # type: ignore[attr-defined,unused-ignore]
 def dlimport(fullpath, suffix=None):