Add initial support for GCJ gij JRE

gij -cp jogl-all.jar:gluegen-rt.jar com.jogamp.opengl.JoglVersion
gij -cp jogl/build-x86/jar/jogl-all.jar:gluegen/build-x86/gluegen-rt.jar:jogl-test.jar:junit.jar com.jogamp.opengl.test.junit.jogl.demos.es1.newt.TestRedSquareES1NEWT -width 1980 -height 1080 -time 40000