QNativeSocketEngine: use stream-style qDebug to fix a warning about FD types.

FD types differ depending on the platform, so using the stream form is the
easiest way to make this work.

Change-Id: I00b1a303f3d865fe5e89ba97bd438c51c6cd8f09
Reviewed-by: Richard J. Moore <rich@kde.org>
QNativeSocketEngine: Add debug in createNewSocket.

If this fails, we want to know about it when trying to debug.

Change-Id: I33f05186e93fcd9284a7e7c609d00fe7ac87cd4e
Reviewed-by: Richard J. Moore <rich@kde.org>