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riscv32imc_esp_espidf: set max_atomic_width to 64 For espidf targets without native atomics, there is atomic emulation inside [the newlib component of espidf](https://github.com/espressif/esp-idf/blob/master/components/newlib/stdatomic.c), this has been extended to support emulation up to 64bits therefore we are safe to increase the atomic width for the `riscv32imc_esp_espidf` target. Closes https://github.com/esp-rs/rust/issues/107 cc: `@ivmarkov`