not rebuilding out-of-date derived^2 objects

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Hi,

  Cons 2.3.0 isn't rebuilding "derived derived objects" correctly for me. 
I've attached a tarball you can use to reproduce the behavior, but here's 
what's going on...

  I am building libfoo.a from foo.o, which is built from foo.h and foo.cpp 
in turn. The first time I cons, everything is rebuilt. Then if I add a new 
function (say) to foo.h and cons again. This time foo.o is rebuilt but 
libfoo.a is not, even though foo.o's contents have changed.

  I have left SourceSignature and SIGNATURE alone so they should be 
defaulting to 'build', but it doesn't seem to matter. Also I am using two 
Conscript files, one for the object file and one for the lib, because this 
mimics the situation I first encountered the problem in. Anyway untar and 
have a look for yourself.

  Am I using cons in a way that wasn't intended? Any ideas?

  -Alan

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