RFC: Make w32api headers (effectively) self-contained

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Guys,

I've started playing with autotest, to implement unit tests for mingwrt
and w32api; (so far, I've implemented several tests for mingwrt, among
them a test group to verify self-containment of system headers).  This
is fine for mingwrt, but right now, if I invoke (say):

  $ echo '#include <winuser.h>' | mingw32-gcc -c -xc - -o /dev/null

I see a swathe of error messages, relating to undefined (custom) data
types; (winuser.h has inherent prerequisite dependencies on windef.h,
stdarg.h, and by default wingdi.h).  I don't know how Microsoft handle
this, but IMO it is just dreadfully poor software engineering; users
should not need to be concerned by such interdependencies among system
headers.

I'd like to start adding #include statements, as required, to make each
system header (effectively) self contained, and implement unit tests to
verify them.  Any reasons why I shouldn't do this?

- -- 
Regards,
Keith.

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