hg: jdk9/sandbox: Removing unnecessary files; adding a description file to generate ct.sym

[jan.lahoda at oracle.com]

Changeset: 255e72ef3778
Author:    jlahoda
Date:      2015-03-13 13:35 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/255e72ef3778

Removing unnecessary files; adding a description file to generate ct.sym

! make/Images.gmk
- make/data/symbols/jdk.dev-7.sym.txt
- make/data/symbols/jdk.dev-8.sym.txt