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19106: core/lib: Add macros/utils.h header r=aabadie a=maribu ### Contribution description The macros CONCAT(), MIN(), and MAX() are defined over and over again in RIOT's code base. This de-duplicates the code by moving the macros to a common place. ### Testing procedure Generated binaries don't change, as this only a de-duplication of macros that doesn't change their definition. ### Issues/PRs references None Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>