Only check DHT marker for libjpeg-turbo #9025
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radarhere changed the title 
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Resolves #9024
The issue found that with libjpeg, rather than libjpeg-turbo, a test checking for a DHT marker is not found.
From https://en.wikipedia.org/wiki/JPEG, a DHT marker is
and it
From https://github.com/libjpeg-turbo/libjpeg-turbo,
It doesn't seem unreasonable that libjpeg-turbo would have different output regarding Huffman tables.
This PR skips checking that marker if libjpeg-turbo is not used.