Windows; GetSystemTimeAsFileTime

Windows; GetSystemTimeAsFileTime

As per Raymond Chen's "The Old New Thing" blog

  http://blogs.msdn.com/b/oldnewthing/archive/2013/11/01/10462403.aspx

Calling GetSystemTime() followed by SystemTimeToFileTime() performs
two format translations which can be avoided by using
GetSystemTimeAsFileTime() directly.

Change-Id: I3d3de0e045777c9dfdb1c1f4503bfdfe19fb7b73
Reviewed-on: http://gerrit.openafs.org/10430
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>