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This makes use of the new bug modeling to declare all platforms that can use newlib and have no reentrancy hooks as affected by the non-thread-safe stdio bug. (Which is every platform but ESP* and AVR, the former because the reentrancy hooks are provided, the latter because we do not and never will support newlib on them.) Building on that, the mpaland-printf package is used when newlib is used and the bug is present. This way we can rely on the stdio being thread-safe on every platform and not causing random crashes at run time. Co-authored-by: mguetschow <mikolai.guetschow@tu-dresden.de>