sys/tiny_strerror: fix compilation on LLVM#20483
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Mixing address spaces is something LLVM doesn't like (for good reason). This re-organized the code a bit so that this does not happen anymore, even on AVR. Split out of RIOT-OS#16924
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Contribution description
Mixing address spaces is something LLVM doesn't like (for good reason). This re-organized the code a bit so that this does not happen anymore, even on AVR.
Testing procedure
The function should still be semantically equivalent; ideally even the machine code generated is not changed (or at least not larger).
Issues/PRs references
Split out of #16924