Squashed 'external/SDL/' content from commit 4d17b99d0a
git-subtree-dir: external/SDL git-subtree-split: 4d17b99d0a1c33c5257063b098f883c669ade40b
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git-subtree-dir: external/SDL git-subtree-split: 4d17b99d0a1c33c5257063b098f883c669ade40b