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* Partially revert a change made in 69ceb95ddc. The change caused the 'libretro_directory' config option to always revert to the default value, which was not intended behavior. Reported-by: Michael Cook * platform: Honor the LIBRETRO_DATABASE_DIRECTORY environment variable. This is a follow-up to commit 69ceb95ddc. * frontend/drivers/platform_unix.c (libretro_database_directory): New variable. (frontend_unix_get_env): Set DEFAULT_DIR_DATABASE to the value of the LIBRETRO_DATABASE_DIRECTORY environment variable, if available. * frontend/drivers/platform_win32.c: Likewise. * configuration.c (config_load_file) <libretro_database_directory>: New variable. Use the values of the LIBRETRO_DATABASE_DIRECTORY environment variables instead of their corresponding configured values, when set. * docs/retroarch.6: Document. * retroarch.c (retroarch_print_help): List supported environment variables, and cross-reference the man page.
