Ensure all images of a GraalVM build require --link-at-build-time

Author: olpaw

sdk/mx.sdk/mx_sdk_vm_impl.py

@@ -1247,6 +1247,7 @@ def contents(self):
             image_config = self.subject.image_config
             build_args = [
                 '--no-fallback',
+                '--link-at-build-time',
                 '--initialize-at-build-time=org,com,net,jdk,javax,java,sun,apple',
                 '-H:+AssertInitializationSpecifiedForAllClasses',
                 '-H:+EnforceMaxRuntimeCompileMethods',