When I do ediff-directories and either directory name I supply
contains "~/", indicating my home direcetory, everything works fine
except for

    ==:	for each session, show which files are identical
    =h:	like ==, but also marks those sessions for hiding
    =m:	like ==, but also marks those sessions for operation

Which, it turns out, is due to a failure to expand the wildcard when
invoking "cmp" in ediff-same-file-contents.  

Here's a patch that fixes it: