Add forward compatibility so that new binaries can run on old
kernels. If the new system call from ino64 isn't available on your
system, then the old one will be used and the results translated. The
stat and statfs families of functions are fully emulated. The
getdirentries family uses tricks that may not work on remote
filesystems.
Tested on: 12-current binaries on a 10.3-beta kernel run and
return consistent results.
This version likely has weak / strong symbol issues due to the foo, _foo and __sys_foo tricks we use in libc.