Since commit 37717b229f ("sys: util: rename Z_MIN Z_MAX Z_CLAMP to min
max and clamp"), <zephyr/sys/util.h> unconditionally defines function-
like macros named `min`, `max`, and `clamp` in the global namespace (in
C mode). util.h gets pulled in transitively by very broad headers,
including the POSIX layer's <pthread.h>, so any third-party C code that
uses these names as ordinary identifiers (e.g. XNNPACK's static `clamp`
helper and its public `clamp` struct field) fails to build as soon as
<pthread.h> is included.
Following the approach used by Linux, move the lowercase `min`, `max`,
`min3`, `max3`, and `clamp` macros (and their helpers) into a new
<zephyr/sys/minmax.h> header that has to be included explicitly by
source files that want them. util.h keeps the uppercase MIN/MAX/CLAMP,
so most code is unaffected; only the (much smaller) set of files that
actually use the lowercase variants needs to pick up the new include.
Fixes#107853.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
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