Removal of the old build system, partial review

[Magnus Ihse Bursie]

I have started working on removing the old build system. See 
https://bugs.openjdk.java.net/browse/JDK-8027566.

I plan do to this in several steps. I have not decided wether to commit 
these steps as separate bugs, or just use this division to facilitate 
developing and reviewing the fix. (Feedback on this appreciated!)

As a first step, I identified all files that was not used at all 
anymore, and deleted these. The webrev I'm publishing here contains 
these deletes.

As a second step, I'm processing the remaining files and see why they 
are still used, from where, and if they can move to better places. A lot 
of them are only used in closed sources, and should therefore move to 
the closed repositories. Some of them are used by the new build system, 
and should be integrated into the new build system instead.

Finally, I plan to move the new build system from "makefiles" to the 
now-more-or-less-empty "make" directories. For a full rationale of this, 
please see the JBS bug. In short: it makes no sense to have to make 
directories, and we can't get rid of the "make" directory anyhow.

But in this step is just the removal of the non-problematic parts of the 
old build. If you see anything being removed here that should not be, 
please let me now!

Also, I have replaced the old top-level Makefile with the contents of 
NewMakefile.gmk.

(The .jcheck removals are just while I'm working, I couldn't find an 
easy way to hide them in the webrev. I do not intend to check them in).

WebRev: http://cr.openjdk.java.net/~ihse/remove-old-build-part-1/webrev.02

/Magnus