External GE renderer: avoid exception "java.lang.UnsatisfiedLinkError: jpcsp.graphics.RE.externalge.NativeUtils.setRendererAsyncRendering". Code clean-up.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3417 4ab978e6-3352-0410-996c-0b42db0051c8