(XS) RFR: JDK-8028770 LIBARCHNAME should not be used in CompileLauncher.gmk

[Tim Bell]

Hi Magnus:

> I sent this some days ago but it seems it never reached the list. :-( 
> I'll give it a new try.
>
> Here's a trivial one.
>
> As reported by Jeremy Manson, LIBARCHNAME as defined in 
> CompileLauncher.gmk seems to be i586 in 32-bit x86 instead of being 
> i386. It's using the wrong make variable. Fortunately, LIBARCHNAME 
> doesn't happen to be used in any of the launchers, so it can be removed.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8028770
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8028770-remove-LIBARCHNAME-from-CompileLauncher/webrev.01

Looks good to me.

Tim