Update cjpeg and djpeg to later versions
Detail: Using the IJG8d code for these disc based utilities gains all of the more recent JPEG extensions including arithmetic coding, when ChangeFSI falls back to using djpeg if the SpriteExtend based decoder can't cope. Makefile and jconfig.h updated to build on RISC OS. Admin: Submission for the JPEG bounty. Version 1.57. Tagged as 'ChangeFSI-1_57'
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