Ensure jimage static jdk library get statically linked

Author: olpaw

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/JRTSupport.java

@@ -61,7 +61,7 @@
  */
 public final class JRTSupport {
 
-    static class Options {
+    public static class Options {
         @Option(help = "Enable support for reading Java modules (jimage format) and the jrt:// file system. Requires java.home to be set at runtime.", type = OptionType.Expert) //
         public static final HostedOptionKey<Boolean> AllowJRTFileSystem = new HostedOptionKey<>(false);
     }

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/jdk/JRTFeature.java

@@ -28,15 +28,23 @@
 
 import com.oracle.svm.core.feature.AutomaticallyRegisteredFeature;
 import com.oracle.svm.core.feature.InternalFeature;
+import com.oracle.svm.core.jdk.JRTSupport;
+import com.oracle.svm.core.jdk.NativeLibrarySupport;
 import com.oracle.svm.hosted.FeatureImpl;
 
 @AutomaticallyRegisteredFeature
 public class JRTFeature implements InternalFeature {
 
+    @Override
+    public boolean isInConfiguration(IsInConfigurationAccess access) {
+        return JRTSupport.Options.AllowJRTFileSystem.getValue();
+    }
+
     @Override
     public void beforeAnalysis(BeforeAnalysisAccess access) {
         access.registerReachabilityHandler(duringAnalysisAccess -> {
             FeatureImpl.BeforeAnalysisAccessImpl beforeAnalysisAccess = (FeatureImpl.BeforeAnalysisAccessImpl) access;
+            NativeLibrarySupport.singleton().preregisterUninitializedBuiltinLibrary("jimage");
             beforeAnalysisAccess.getNativeLibraries().addStaticJniLibrary("jimage");
             if (!Platform.includedIn(Platform.WINDOWS.class)) {
                 beforeAnalysisAccess.getNativeLibraries().addDynamicNonJniLibrary("stdc++");