Regression introduced in: cc-rs 1.1.32.

Problem: The target is misidentified as riscv32imc_zicsr_zifencei-esp-espidf. While this would be a "correctly" formed target for a riscv target with respect to riscv ISA version 2.1, this is not a correct target description for any esp-idf target introduced on ISA 2.0.

The esp-idf targets where added while the underlying compiler still supported the riscv ISA 2.0 that did not include any zicsr_zifencei description. E.g the official names are listed https://doc.rust-lang.org/rustc/platform-support/esp-idf.html#requirements there.