VertexDecoderRiscV.cpp got <cfloat> through SmallDataConvert.h, and three
headers used malloc/free without <cstdlib>, which libc++ no longer brings in.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
pngLoadPtr allocated the decoded buffer directly from attacker-controlled
PNG IHDR dimensions with no upper bound, so browsing a crafted game icon
or savedata could trigger a multi-gigabyte allocation.
- Add maxWidth/maxHeight parameters to pngLoadPtr (default 8192x8192)
and reject images larger than the limits.
- Thread the limits through LoadTextureLevelsFromFileData,
CreateTextureFromFileData, and CreateTextureFromFile.
- Limit game icons to 256x128 in GameInfoCache and IconCache.
