kernel32: initialize hole in struct in WaitNamedPipeW to avoid Valgrind warnings, take 2

[Dan Kegel]

Back in February, I tried doing this with a real memset,
but Alexandre demurred, probably objecting to the slight overhead.
So here's a version with no overhead unless you
have the Valgrind development headers installed,
and is done with Valgrind client notations.

Prevents warnings like:

 Syscall param writev(vector[...]) points to uninitialised byte(s)
    at  (within /lib/ld-2.5.so)
    by  wine_server_call (server.c:244)
    by  server_ioctl_file (file.c:1027)
    by  NtFsControlFile (file.c:1241)
    by  WaitNamedPipeW (sync.c:1326)
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