cmake: tidy up string append and list prepend syntax #16144
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set(VAR "${VAR}<value>")→string(APPEND VAR "<value>")Available since CMake 3.4:
https://cmake.org/cmake/help/latest/command/string.html#append
set(VAR "${VAR2}-or-<value>;${VAR}")→set(VAR "${VAR2}-or-<value>" ${VAR})