Vendored libdeflate decompress-only C sources into src/performance/.
Compiled as static lib (x86-windows-gnu for libc headers), linked into
the DLL. AVX-512 disabled (not available on 32-bit x86), SSE2/AVX2
paths active.
Target: replace WoW's embedded zlib inflate (~3% CPU) with libdeflate's
~2.3x faster implementation. Hook integration next.
