RFR: JDK-8168950: Incremental build of images always rebuilds jmods

[Tim Bell]

Erik:

> A mistake in JDK-8166948 is causing jmods and images to always be
> rebuilt on subsequent calls to make when nothing should have changed. I
> forgot to touch the marker file at the end of the recipe for doing the
> module-info optimization.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8168950
>
> Patch:
>
> diff -r b913840943c0 make/ExplodedImageOptimize.gmk
> --- a/make/ExplodedImageOptimize.gmk
> +++ b/make/ExplodedImageOptimize.gmk
> @@ -39,6 +39,7 @@
>  $(PACKAGES_ATTRIBUTE_TARGET): $(ALL_MODULEINFO_CLASSES)
> $(BUILD_JIGSAW_CLASSES)
>      $(call LogInfo, Optimizing the exploded image)
>      $(TOOL_ADD_PACKAGES_ATTRIBUTE) $(JDK_OUTPUTDIR)
> +    $(TOUCH) $@
>
>  TARGETS := $(PACKAGES_ATTRIBUTE_TARGET)

Looks good.  Approved.

Tim