New in version 3.18.
Default framework filename postfix under configuration <CONFIG> when using a multi-config generator.
When a framework target is created its FRAMEWORK_MULTI_CONFIG_POSTFIX_<CONFIG> target property is initialized with the value of this variable if it is set.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_FRAMEWORK_MULTI_CONFIG_POSTFIX_CONFIG.html