Add substitution that ensures Classloader#library is never used in native

Fixes: #8785

Author: geoand

extensions/mongodb-client/runtime/src/main/java/io/quarkus/mongodb/runtime/graal/MongoClientSubstitutions.java

@@ -173,3 +173,13 @@ public String resolveAdditionalQueryParametersFromTxtRecords(final String host)
         throw new UnsupportedOperationException("mongo+srv:// not supported in native mode");
     }
 }
+
+@TargetClass(com.sun.jna.Native.class)
+final class JnaNativeSubstitutions {
+
+    // This method can trick GraalVM into thinking that Classloader#findLibrary is getting called
+    @Substitute
+    public static String getWebStartLibraryPath(final String libName) {
+        return null;
+    }
+}