This suppresses compiler warnings in GHA CI:
>ld: warning: direct access in function 'std::__1::__function::__func<libtorrent::storage_interface* (*)(libtorrent::storage_params const&, libtorrent::file_pool&), std::__1::allocator<libtorrent::storage_interface* (*)(libtorrent::storage_params const&, libtorrent::file_pool&)>, libtorrent::storage_interface* (libtorrent::storage_params const&, libtorrent::file_pool&)>::target(std::type_info const&) const' from file '/usr/local/lib/libtorrent-rasterbar.a(create_torrent.cpp.o)' to global weak symbol 'typeinfo name for libtorrent::storage_interface* (*)(libtorrent::storage_params const&, libtorrent::file_pool&)' from file 'src/base/libqbt_base.a(mocs_compilation.cpp.o)' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
And also makes the binary a bit smaller.
https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Code-Gen-Options.html#index-fvisibility
PR #19921.
* Downgraded macOS CI to Qt 6.2.0 due to a bug in Qt Test module
* Revised cmake build scripts
* For now, only building via cmake is supported
PR #17338.
