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* Unaligned access support for pgm_read_word/dword * Fix pgm_read_ptr_aligned() per #5735 * Allow users to use aligned-only via a #define Adding -DPGM_READ_UNALIGNED=0 or #define PGM_READ_UNALIGNED 0 will change the default at compile-time to only aligned (faster, but less compatible) macro implementations. Default is still to allow unaligned accesses.