cmake-native.bbclass: Add ubfs specific variable to ignore list

[kraj]

These variables show up as dependencies of native recipes otherwise can cause clang-native to rebuild without a reason just when defined by a machine using ubifs.

---

Contributor checklist

• Changes have been tested
• Signed-off-by is present
• The PR complies with the Open Embedded Commit Patch Message Guidelines

Reviewer Guidelines

• When submitting a review, please pick:
  • 'Approve' if this change would be acceptable in the codebase (even if there are minor or cosmetic tweaks that could be improved).
  • 'Request Changes' if this change would not be acceptable in our codebase (e.g. bugs, changes that will make development harder in future, security/performance issues, etc).
  • 'Comment' if you don't feel you have enough information to decide either way (e.g. if you have major questions, or you don't understand the context of the change sufficiently to fully review yourself, but want to make a comment)

[shr-project]

How these variables end in cmake signature? I don't see it here, does some BSP export them or something? I think then the BSP layer should be fixed.

[kraj]

they dont, the real problem was from BSP exporting these symbols for no reason. I will send a revert