Update native-image.properties

(cherry picked from commit de9e4ba)

Author: timfel

mx.graalpython/native-image.properties

@@ -6,4 +6,6 @@ Requires = language:regex language:llvm
 JavaArgs = -Xmx4G -Dpolyglot.engine.PreinitializeContexts=python
 
 Args = -H:MaxRuntimeCompileMethods=7000 \
+       -H:+AddAllCharsets \
+       --initialize-at-build-time=com.oracle.graal.python,org.antlr.v4 \
        -H:SubstitutionResources=com/oracle/graal/python/aot/substitutions.json