Fix #4248

Change how the ALPN selection is done in JDK8 and before to for the usage of Jetty.
That way we do not have to delete Conscrypt anymore and it fixes the issue.

extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/graal/NettySubstitutions.java

@@ -12,11 +12,11 @@
 import javax.net.ssl.TrustManagerFactory;
 
 import com.oracle.svm.core.annotate.Alias;
-import com.oracle.svm.core.annotate.Delete;
 import com.oracle.svm.core.annotate.RecomputeFieldValue;
 import com.oracle.svm.core.annotate.Substitute;
 import com.oracle.svm.core.annotate.TargetClass;
 import com.oracle.svm.core.jdk.JDK11OrLater;
+import com.oracle.svm.core.jdk.JDK8OrEarlier;
 
 import io.netty.bootstrap.AbstractBootstrapConfig;
 import io.netty.bootstrap.ChannelFactory;
@@ -92,11 +92,6 @@ final class Target_io_netty_handler_ssl_SslHandler$SslEngineType {
     }
 }
 
-@Delete
-@TargetClass(className = "io.netty.handler.ssl.ConscryptAlpnSslEngine")
-final class Target_io_netty_handler_ssl_ConscryptAlpnSslEngine {
-}
-
 @TargetClass(className = "io.netty.handler.ssl.JdkAlpnApplicationProtocolNegotiator$AlpnWrapper", onlyWith = JDK11OrLater.class)
 final class Target_io_netty_handler_ssl_JdkAlpnApplicationProtocolNegotiator_AlpnWrapper {
     @Substitute
@@ -107,6 +102,43 @@ public SSLEngine wrapSslEngine(SSLEngine engine, ByteBufAllocator alloc,
 
 }
 
+@TargetClass(className = "io.netty.handler.ssl.JdkAlpnApplicationProtocolNegotiator$AlpnWrapper", onlyWith = JDK8OrEarlier.class)
+final class Target_io_netty_handler_ssl_JdkAlpnApplicationProtocolNegotiator_AlpnWrapperJava8 {
+    @Substitute
+    public SSLEngine wrapSslEngine(SSLEngine engine, ByteBufAllocator alloc,
+            JdkApplicationProtocolNegotiator applicationNegotiator, boolean isServer) {
+        if (Target_io_netty_handler_ssl_JettyAlpnSslEngine.isAvailable()) {
+            return isServer
+                    ? (SSLEngine) (Object) Target_io_netty_handler_ssl_JettyAlpnSslEngine.newServerEngine(engine,
+                            applicationNegotiator)
+                    : (SSLEngine) (Object) Target_io_netty_handler_ssl_JettyAlpnSslEngine.newClientEngine(engine,
+                            applicationNegotiator);
+        }
+        throw new RuntimeException("Unable to wrap SSLEngine of type " + engine.getClass().getName());
+    }
+
+}
+
+@TargetClass(className = "io.netty.handler.ssl.JettyAlpnSslEngine", onlyWith = JDK8OrEarlier.class)
+final class Target_io_netty_handler_ssl_JettyAlpnSslEngine {
+    @Alias
+    static boolean isAvailable() {
+        return false;
+    }
+
+    @Alias
+    static Target_io_netty_handler_ssl_JettyAlpnSslEngine newClientEngine(SSLEngine engine,
+            JdkApplicationProtocolNegotiator applicationNegotiator) {
+        return null;
+    }
+
+    @Alias
+    static Target_io_netty_handler_ssl_JettyAlpnSslEngine newServerEngine(SSLEngine engine,
+            JdkApplicationProtocolNegotiator applicationNegotiator) {
+        return null;
+    }
+}
+
 @TargetClass(className = "io.netty.handler.ssl.Java9SslEngine", onlyWith = JDK11OrLater.class)
 final class Target_io_netty_handler_ssl_Java9SslEngine {
     @Alias