Revert "[UBSan] [min-rt] make minimal runtime handlers weak" (#156975) Existing `__ubsan_report_error` should be enough to solve this. Ability to override on two levels, may result in hard to debug bugs when in the same binary strong __ubsan_report_error and __ubsan_handle_##name##_minimal_abort defined in unrelated components. With one entry point we will have at least linking error. Reverts llvm/llvm-project#154220
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