g++.dg not having one .exp per directory

[Paolo Bonzini]

I have noticed that g++.dg does not have one .exp file per directory, 
and I could not figure out how to run, say, a single test case in the 
g++.dg/tree-ssa directory.

I have modified g++.dg/dg.exp to do so, by using "glob" rather than 
"find", and then I could copy dg.exp to all the directories that don't 
already have a .exp file.

Would the patch be acceptable for 4.1?  What about 4.2?  If not, how do 
I achieve the same result?  :-)

Paolo