Fixes #51: whitelist syscall fadvise64_64.
fadvise64_64 is used by glibc to implement posix_fadvise() on arch i386 (when compiling with -D_FILE_OFFSET_BITS=64).
fadvise64_64 is used by glibc to implement posix_fadvise() on arch i386 (when compiling with -D_FILE_OFFSET_BITS=64).