This shouldn't change behavior (or even object code) at all because
those assignments are all without effect. Removing that code removes
noise which helps working with code analysis tools.
This commit will not completely remove all Imake files, specifically
those for sections that have not been completed yet.
Also, the databases dir has been moved to databases-delete-later until
we have everything building and installed properly.
Mostly missing headers, explicit parentheses and new prototypes.
Some Caveats:
* I haven't compile-tested the SVR4 getpty file, it might need another tweak
* There were operator precedence bugs in TermPrimCursor.c and TermPrimRender.c
(^ vs. !=). This might change behaviour, but at least I haven't experienced
any crashes ...
* This adds a little more dependencies for include ordering, but unless we
want to play the "headers that include headers that include headers..." game,
this is unavoidable.