Bradley Sepos 642d8f7095 tools: Revert unintentional submodule version change. ...

An older version of Discount was accidentally committed as part of 1f57d2e8d1.

2019-01-25 23:20:48 -05:00

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discount @ 51958b09a0

tools: Revert unintentional submodule version change.

2019-01-25 23:20:48 -05:00

libpng @ ed5a01d922

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pngquant @ c4408f3f4c

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zlib @ 5089329162

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zopfli @ 6818a08590

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