Need reviewer: fix to prtconf on solaris builds

[Kelly O'Hair]

Openjdk6 change... creates annoying error messages during builds on solaris without it.

Don't really need a reviewer since the same exact change was pushed into jdk7 a while back by Katleman.

7022473: JDK7 still runs /etc/prtconf to find memory size
http://cr.openjdk.java.net/~ohair/openjdk6/openjdk6-prtconf/webrev/


David? This look ok?

-kto