fusion: add a stub for CopyPDBs (try 2)

[Sebastian Lackner]

On 04.12.2015 17:27, Austin English wrote:
> This fixes https://bugs.winehq.org/show_bug.cgi?id=39535
> 
> Supersedes https://source.winehq.org/patches/data/117083
> 

Looks good to me, thanks. For those who didn't follow the discussion
on IRC, despite the fact that some code samples suggest the parameter
could be an interface, the application in question calls it with a
base64 encoded string parameter. Until we know more exactly how this
function works, I think its fine to use "void *". The patch lets the
installer succeed successfully and the risk of regressions is very
small, because the stub was already present before.

Signed-off-by: Sebastian Lackner <sebastian at fds-team.de>