Build Process Fixes

Hi,

I attempted to build the Nokia fork of LWUIT from source using the build-release.xml file.  I found that there were hardcoded references in all the subprojects to C:\Tools\Nokia\ which would otherwise have to be changed in all files manually on every build target.

I have changed this to having a properties file where this can be set and looking for the environment variable LWUIT_HOME.  I also found that some of the calls from build-release.xml were going to the NetBeans build.xml instead of build-antenna.xml which would be more suitable for a command line build process.

I found that the bootclasspath used does not work on Sun WTK 2.5.2 on Linux (the latest available for that) and added a method to detect and workaround that.  I tested building against Sun WTK 3.4 w/ Windows 8 and JDK8, Nokia SDK 2.0 w/Windows 8 and JDK8, Sun WTK 2.5.2 on Ubuntu Linux with JDK 7.

Hope this can be pulled to master.

-Mike