Keeps our two local changes (the ppsspp_config.h include and the ARM32
prefetch in the XXH32 loop). Hash values are unchanged.
XXH3 is much faster on ARM64 now: about 37 GB/s against 13.5 with v0.8.1
on a Snapdragon X, where our quick texture hash does 24.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>