Fixup lib target

Realized after-the-fact that the 'lib' target is a convention whereby the last
step in the recipe is to touch a file called 'lib'.
Remove 'make depend' cleanup from dclean targets

This was automatically applied by RemoveOldMakeDependOutput() in:
https://code.google.com/p/mike-bland/source/browse/openssl/update_makefiles.py