IAR: Restore support for projects not enabling policy CMP0057
Since !6372 (merged), we use the
IN_LIST operator in the
CMakeFindBinUtils module. Set policy
CMP0057 to ensure it is available regardless of the project's policy settings.
The search logic for the IAR linker, librarian and related tools uses the IN_LIST operator which is ignored unless CMP0057 is set to NEW. The CMP0057 policy is now set to NEW for the complete
Fixes: #22640 (closed)