[8u20] Request for approval, backport of 8026385, 8003900, 8042440, 8038027

[David DeHaven]

The following fixes have been incubating in 9 and the backports are essentially unmodified.

8026385: [macosx] (awt) setjmp/longjmp changes the process signal mask on OS X
http://hg.openjdk.java.net/jdk9/client/jdk/rev/b5f284a0059b


8003900: X11 dependencies should be removed from Mac OS X build.
http://hg.openjdk.java.net/jdk9/client/jdk/rev/56024e323104


8042440: awt_Plugin no longer needed
http://hg.openjdk.java.net/jdk9/client/jdk/rev/75206fa5a43e


8038027: DTDBuilder should be run in headless mode
http://hg.openjdk.java.net/jdk9/client/jdk/rev/0eab6c63201d


8042440 and 8038027 have trivial conflicts due to minor surrounding differences but the actual changes are identical.

I need a Committer to push for me, I have the closed source changes for 8026385 ready as well. 8042440 has changes in deploy but they were backported already.



JPRT run resulted in 9 failures, all of which can be accounted for.

Eight failures are due to:
https://bugs.openjdk.java.net/browse/JDK-8040038

The remaining failure is due to:
https://bugs.openjdk.java.net/browse/JDK-8039212

Neither fix has been backported to 8u yet.

-DrD-