The DdeInternal::Cli/SrvCallback functions apparently had broken signatures for
64-bit Windows (32-bit DWORD vs. 64-bit ULONG_PTR parameters), but I assume that
was actually harmless, as I think that, for Windows x86-64, those arguments are
pushed on the stack right-to-left (regardless of CALLBACK), and they are the
last arguments, and SrvCallback doesn't look at them at all, and CliCallback
only looks at the lower 32-bit DWORD of the first one (nInfo1).

Change-Id: Id77749dd2d29180e2d11b0ae2ad248ac1a7f1bdf
Reviewed-on: https://gerrit.libreoffice.org/29848Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>