[links] Updated xdnd patch

[Edward Rosten]

This patch implements dnd support inlinks (you can currently drop stuff). 
It has a few bugs fixed compared to the last version.

The old version would try to free a null location when links quit if no 
data had been dropped on links.

The old version would build an incorrect XdndFinished ClientMessage which 
would upset GTK based programs slightly.

-Ed
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