fix build

Author: GoeLin

test/jdk/tools/jpackage/helpers/jdk/jpackage/test/Executor.java

@@ -38,6 +38,7 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
+import java.util.function.Supplier;
 import java.util.regex.Pattern;
 import java.util.spi.ToolProvider;
 import java.util.stream.Collectors;