pdh: add PdhGetLogFileTypeA/W stubs

[Sebastian Lackner]

On 23.12.2015 07:36, Austin English wrote:
> Fixes https://bugs.winehq.org/show_bug.cgi?id=23298
> 
> The function is undocumented, but from reading the documented
> functions, especially PdhGetLogFileSize
> (https://msdn.microsoft.com/en-us/library/windows/desktop/aa372639%28v=vs.85%29.aspx),
> I made an educated guess.
> 

When there are two functions with A and W suffix, this strongly
suggests that there must be a filename parameter somewhere. This
means the current interpretation is definitely not correct. Did
you verify if it prints useful values?