ediff-directories doesn't respect mouse-1-follows-link

[David Reitter]

When clicking on a file pair in a buffer produced by ediff- 
directories, mouse-1 doesn't do anything. It should open the  
respective file instead. I have `mouse-1-follows-link' enabled (I  
only have one mouse button on my laptop) and I believe this setting  
should be respected (whether you call the clickable file entries in  
the buffer a "link" internally or not).

This is the latest CVS version that I'm using.

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