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Add basic RISCV64 shellcraft support (#2322)

* Add basic RISCV64 shellcraft support

The `mov` template isn't 100% null-byte and newline free
for all inputs. Certain larger values are just emitted using
the `li` pseudo-instruction by the assembler which might
contain null-bytes.

Co-authored-by: LevitatingLion <levitatinglion@web.de>

* Generate RISCV syscall constants from musl-libc

diet-libc doesn't support RISCV, so borrow from musl.
Need to consider their license.

* Update CHANGELOG

* Fix CHANGELOG

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Co-authored-by: LevitatingLion <levitatinglion@web.de>

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