Don't Include `sanitizer/msan_interface.h`, Since Not All Platforms Provide It
Don't Include `sanitizer/msan_interface.h`, Since Not All Platforms Provide It

Instead, explicitly declare the functions we use.

Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd