Lossless conversion for webp#7348

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morsssss:webp-lossless

Commits on Aug 6, 2021

Lossless conversion for webp
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Commits on Aug 11, 2021

Created IMG_WEBP_LOSSLESS constant
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Commits on Aug 12, 2021

Guard against older versions of gd that lack gdWebpLossless
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