Ensure _native_junit does not put builder-parts on the image-classpath

Author: olpaw

substratevm/mx.substratevm/mx_substratevm.py

@@ -623,7 +623,7 @@ def dummy_harness(test_deps, vm_launcher, vm_args):
             mx.abort('No matching unit tests found. Skip image build and execution.')
         with open(unittest_file, 'r') as f:
             mx.log('Building junit image for matching: ' + ' '.join(l.rstrip() for l in f))
-        extra_image_args = mx.get_runtime_jvm_args(unittest_deps, jdk=mx_compiler.jdk, exclude_names=['substratevm:LIBRARY_SUPPORT'])
+        extra_image_args = mx.get_runtime_jvm_args(unittest_deps, jdk=mx_compiler.jdk, exclude_names=mx_sdk_vm_impl.NativePropertiesBuildTask.implicit_excludes)
         macro_junit = '--macro:junit'
         if force_builder_on_cp:
             macro_junit += 'cp'