hg: ppc-aix-port/jdk7u: Add section about the necessity of 'GNU tar' during the build process

[volker.simonis at gmail.com]

Changeset: 06179726206f
Author:    simonis
Date:      2012-11-12 09:30 +0100
URL:       http://hg.openjdk.java.net/ppc-aix-port/jdk7u/rev/06179726206f

Add section about the necessity of 'GNU tar' during the build process

! README-ppc.html