Review Request: Build-infra M1

[Fredrik Öhrström]

----- ahughes at redhat.com skrev:
> I know that's the current status quo.  It seemed to be being
> suggested that the closed rules be removed from the public Makefiles and kept
> separately.  Maybe I misunderstood.

Well, I guess I would like the closed rules be so simple that
the default add/override functionality in the configure script
is enough. 

> With IcedTea, most of the changes are build changes for obvious
> reasons, so nearly every commit was regenerating configure :-)

The goal for the new build system must be, that for normal OpenJDK development,
there should rarely be any need to regenerate configure. The configure script
and the makefiles should deal with any normal change/addition/removal of source code
and new modules. Configure should only change to manage new platforms, new
compilers etc.

//Fredrik