RFR: JDK-8143141: Bring in minor build changes from the jigsaw/jake forest

[Erik Joelsson]

Hello,

When bringing changes from jdk9 to jigsaw/jake, the merges have become 
quite involved. The build files in jdk9 and jake have also diverged 
unnecessarily over time. I would like to bring them back closer to each 
other so that we are only carrying the changes we really need to in jake.

The changes in these patches include:

* Introducing GENSRC_OUTPUTDIR, HEADERS_OUTPUTDIR, NATIVE_OUTPUTDIR and 
MODULES_*_OUTPUTDIR. These variables are needed to be able to globally 
override these output directories. While not needed right now in jdk9, 
it is one of the largest and most annoying changes to keep merging in jake.
* Adding some more utilities to the BUILD_TOOLCHAIN (AR, AS, NM)
* Cleaning up CompileJavaModules.gmk and removing the redundant macro 
call setup.
* Filtering of modules in images uses the global MODULES_FILTER.
* Minor cleanup in SetupJavaCompilation macro.
* Removed redundant classpath flags for launchers jdb and jconsole

Bug: https://bugs.openjdk.java.net/browse/JDK-8143141
Webrevs:
http://cr.openjdk.java.net/~erikj/8143141/webrev.top.01/
http://cr.openjdk.java.net/~erikj/8143141/webrev.langtools.01/
http://cr.openjdk.java.net/~erikj/8143141/webrev.corba.01/
http://cr.openjdk.java.net/~erikj/8143141/webrev.hotspot.01/
http://cr.openjdk.java.net/~erikj/8143141/webrev.jdk.01/

/Erik