Missing equalities in Names-like structures.
Revert "Makefile: the initial build of grammar.cma is now directory-driven"

This reverts commit f694544d016b085b3cd10007b9f7716ae2c3b022.

This commit was wrong, since (at least) the highparsing part depends
on the toplevel directory. I still didn't had time to fix that, so
in the meantime let's revert it.