Fix for Flatpak being unable to download during CMake configure.
Fix for flatpak having no internet access during CMake configure.
Use lat9nq/tzdb_to_nx release data to generate header files. nx_tzdb: Use an interface library nx_tzdb: Gate download if achive not exists nx_tzdb: Fix header generator brace closing nx_tzdb: Add base directory files nx_tzdb: Add SPDX info