Request for review: 7030063 AWT support for SE-Embedded integration

[David Holmes]

(build-dev cc'ed as there are some makefile changes (Hi Kelly! :) ) )

webrev:

http://cr.openjdk.java.net/~dholmes/7030063/webrev/

This CR integrates support for SE-Embedded into the AWT. The main 
changes are:

- forward-port from JDK6 the replacement of hard-wired X11 paths to use 
OPENWIN_HOME-based paths
- cross-compilation support
- Support for BUILD_HEADLESS_ONLY, which is a specialized build for 
environments where there are no X11 libraries available at build-time. 
X11 headers are still needed due to various dependencies in the native code.
- Customize the tray-icon timeout for slow devices
- Add new HToolkit for headless environments without any xawt support 
(used for SE-Embedded reduced-headless builds for which the VM 
automatically sets -Djava.awt.headless=true)
- Update logic for default toolkit selection on Solaris/Linux (AWT team 
request)
- SE-Embedded specific customizations (conditional on defining 
JAVASE_EMBEDDED in the build variables)
- New AWT event polling algorithm with changed defaults for SE-Embedded 
(SE behaviour remains the same)

Thanks,
David Holmes
Java SE VM Embedded Team