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.

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[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