Add necessary --initialize-at-build-time for building an image with --language:ruby

* I checked this is equivalent to --initialize-at-build-time for all classes,
  except for the application classes initializers which are delayed, as intended.
* `org.fusesource` is part of the JLine jar.

Author: eregon

mx.truffleruby/native-image.properties

@@ -10,7 +10,8 @@ LauncherClassPath = languages/ruby/truffleruby-annotations.jar:languages/ruby/tr
 
 Args = -H:MaxRuntimeCompileMethods=5400 \
        -H:SubstitutionResources=org/truffleruby/aot/substitutions.json \
-       -H:+AddAllCharsets
+       -H:+AddAllCharsets \
+       --initialize-at-build-time=com.oracle.graal,com.oracle.graalvm,com.oracle.svm,com.oracle.truffle,org.graalvm,org.truffleruby,org.jcodings,org.joni,jline,org.fusesource
 
 JavaArgs = -Dpolyglot.engine.PreinitializeContexts=ruby \
            -Dorg.graalvm.launcher.relative.llvm.home=../lib/cext/sulong-libs