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"keep_in_sync" methods. * external.cc (cygwin_internal): Call above keep_in_sync method when CW_SYNC_WINENV is requested. * path.cc (cwdstuff::init): Don't change to windows_system_directory if keep_in_sync is requested. (cwdstuff::keep_in_sync): New method. (cwdstuff::set): Take sync flag into account.
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