SystemTools: Revert "Reduce scope of 'buf' variable in CollapseFullPath"
Revert commit 6e36d909 (SystemTools: Reduce scope of 'buf' variable in CollapseFullPath, 2019-06-18). A pointer to the buffer is returned by `Getcwd` and stored in `res_in_base`. The buffer must remain valid for the lifetime of that variable.
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