fix UB in shuffle and unshuffle by marking _dst non-const #638
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Context:
#636 I noticed while running my library that relies on blosc2 under
fsanitize=undefinedthat the shuffle implementations did not all have_destmarked as const while the function calling it did. Upon further investigation the function calling shuffle and unshuffle did not have any of these marked as const so there was no deeper impact but I wanted to address it anyways.Changes:
uint8_t*for_dest_srcmarked as non-const.