RFR: JDK-8160490: "installer-only" top level target is broken

[Tim Bell]

Erik:

> A while ago, in JDK-8155689, a workaround was put in place because a 
> temporary broken Jib configuration file. The Jib configuration has 
> since been fixed and the workaround can now safely be removed.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8160490
> Patch:
> diff -r 20f1ee2fe834 make/Main.gmk
> --- a/make/Main.gmk
> +++ b/make/Main.gmk
> @@ -933,10 +933,6 @@
>
>  ################################################################################ 
>
>
> -
> -# workaround issue when building open targets when closed 
> jib-profiles.js is used
> -installer: product-images test-image
> -
>  .PHONY: $(ALL_TARGETS)
>
>  FRC: # Force target

Looks good.

/Tim