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png_handle_unknown() when SAVE support is absent. Moved the shell test scripts for contrib/libtests from the libpng top directory to contrib/libtests. png_handle_unknown() must always read or skip the chunk, if SAVE_UNKNOWN_CHUNKS is turned off *and* the application does not set a user callback an unknown chunk will not be read, leading to a read error, which was revealed by the "tunknown" test.