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risc0-build: allow overriding the Cpp toolchain (#1686)
The previous commit adding the Cpp toolchain disabled overriding the toolchain from the command line via the `CC` and `CFLAGS_riscv32im_risc0_zkvm_elf` environment variable. This change allows developers to override their settings by supplying the default values only if the user does not specify these environment variables as a part of their `cargo` command.
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