Lightweight Java Game Library Code

Mac OS X: Replaced liblwjgl-legacy.jnilib and liblwjgl.jnilib with one liblwjgl.jnilib containing gcc 3 compiled ppc code in the ppc part and gcc 4 compiled intel code in the intel part. That way, we should be able to support all platforms and architectures with one library. I've replaced the Makefile.* files with a single build.xml to do the native building and merging of object code.