Fix locale handling when building with cmake

hyperrealm / libconfig

C/C++ library for processing configuration files

https://hyperrealm.github.io/libconfig/

GNU Lesser General Public License v2.1

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Closed thomastrapp closed 2 years ago

thomastrapp commented 2 years ago

Add check_symbol_exists for locale handling (it was commented out before)
Mac OS: use header "xlocale.h" for checks
Apply the result of these checks not only to libconfig, but also libconfig++
This fixes the build warning "No way to modify calling thread's locale!"
This also fixes the memory leak on Mac OS as described in issue #212.