Bindings to statx syscall which is available in Linux kernel 4.11 ,
implemented by syscall syscall.
Man page of statx: http://man7.org/linux/man-pages/man2/statx.2.html
statx related fn and structs are first included in libc 0.2.56 .
And this crate provide an alternative which is compatible to libc 0.2.3 ,
which is the lowest version with support for syscall.
For system without statx support, the fn statx of this crate will safely
return ENOSYS instead of a compile-time link error.