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>" ${VAR})`
Closes curl#16144
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set(VAR "${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})