Squashed 'external/SDL/' content from commit 716c767b7
git-subtree-dir: external/SDL git-subtree-split: 716c767b7e7099fb0e2fda9db59227a7e1d1d8a4
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git-subtree-dir: external/SDL git-subtree-split: 716c767b7e7099fb0e2fda9db59227a7e1d1d8a4