[opencascade] Fix usage issue

[Cheney-W]

Fixes #33138

1. Add additional header file paths.
2. Add conditions to control whether to search for eigen3. Perhaps eigen3 can be treated as a feature of opencascade.

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[dan-shaw]

I am not exactly sure what this PR fixes. Isn't eigen3 not a dependency of opencascade since the default option is OFF in the CMakeLists.txt?

[Cheney-W]

Yes, as can be seen from the cmakelists.txt, eigen3 is not a dependency of opencascade.
The issue arises because the fix-depend-freetype.patch patch added the find_dependency(Eigen3 REQUIRED) command for OpenCASCADEConfig.cmake.in file, leading to the OpenCASCADEConfig.cmak file always executing find_dependency(Eigen3 REQUIRED), which results in the following error:

Could not find a package configuration file provided by "Eigen3" with any of the following names:
Eigen3Config.cmake
eigen3-config.cmake

To fix this, I didn't remove find_dependency(Eigen3 REQUIRED) from the patch. Instead, I added a condition if(@USE_EIGEN@) to check whether eigen3 is enabled. This way, if eigen3 is added as a feature for opencascade in the future, we wouldn't need to add the related find_dependency() again.

If you think this approach is not appropriate, I can remove find_dependency(Eigen3 REQUIRED) from the patch.