* It will now report some types of errors synchronously, to bring it on
  par with uv-unix. Fixes #865.

* Failure to find the target executable will now set up stdio pipes
  correctly, so the user can assume that when uv_spawn() returns 0 these
  pipes will never trigger asserts in libuv's guts.

This means we no longer have to strip the high bit from the process exit
code on Windows, which is problematic because an unhandled SEH exception
can make a process exit with a status code that has the high bit set.

A stupid oversight in 66ae0ff would cause a random value to be reported
as the exit code for a 'normally exited' child process.

Before this patch libuv would attempt to use GetLastError() to retrieve
the cause of NtQueryInformationFile failure, but that's not how it
should be done.

Copy some more structs from the NT DDK to winapi.h, so people can
compile libuv without installing the DDK.

This commit adds bootrstap code, function signatures, struct definitions
etc. to make it possible for libuv to use NtQueryVolumeInformationFile.

Most of this comes from the NT DDK, which libuv mirrors so that people
don't need the DDK to compile it.

This removes some compiler warnings caused by implicit type conversion
from uint64_t to long, which would happen in the `FILETIME_TO_TIMESPEC`
macro.

This improves the output of uv_fs_stat:
  * `st_ctime` now contains the change time, not the creation time.
  * `st_ino` is now filled in with an fs-specific unique number.
  * `st_dev` is set to the serial number of the containing file system.
  * `st_blocks` now gets set.
  * `st_blksize` is no longer zero, but set to a reasonable default.