RFC: KUSER_SHARED_DATA update patch to fix bug 29168

[Joey Yandle]

> 
> MapViewOfFile (and the underlying NtMapViewOfSection) has support for
> specifying the address to map it.
> 

So what I should do is:

1. in ntdll/thread.c:thread_init:

  int fd = shm_open("/KUSER_SHARED_DATA", O_RDONLY | O_CREAT, 0600);
  // call MapViewOfFile to map fd to 0x7ffe0000


2. in server/main.c:

  int fd = shm_open("/KUSER_SHARED_DATA", O_RDWR | O_CREAT, 0600);
  // call MapViewOfFile to map fd to 0x7ffe0000

  // start thread to update/nanosleep

Is that roughly correct?  How do I translate the fd to a HANDLE for the
first arg to MapViewOfFile?

thanks,

Joey