hg: jdk6/jdk6/hotspot: 7072341: enable hotspot builds on Linux 3.0

[ahughes at redhat.com]

Changeset: 7e36dc39e1e8
Author:    andrew
Date:      2011-07-28 14:10 -0400
URL:       http://hg.openjdk.java.net/jdk6/jdk6/hotspot/rev/7e36dc39e1e8

7072341: enable hotspot builds on Linux 3.0
Summary: Add "3" to list of allowable versions
Reviewed-by: kamg, chrisphi

! make/linux/Makefile