Rollup merge of #47190 - EdSchouten:cloudabi-libpanic, r=alexcrichton

Port libpanic_abort and libpanic_unwind to CloudABI

This change ports both the libpanic* libraries to CloudABI.

The most interesting part of this pull request, however, is that it imports the CloudABI system call API into the Rust tree through a Git submodule. These will also be used by my port of libstd to CloudABI extensively, as that library obviously needs to invoke system calls to implement its primitives.

I have taken the same approach as libc: `src/libcloudabi` + `src/rustc/cloudabi_shim`. If some other naming scheme is preferred, feel free to let me know! As `libcloudabi` is pretty small, maybe it makes sense to copy, instead of using a submodule?

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