hg: build-infra/jdk7: Make sure the list of files is empty to start with.

[fredrik.ohrstrom at oracle.com]

Changeset: 854f31b51e64
Author:    ohrstrom
Date:      2011-11-25 19:47 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk7/rev/854f31b51e64

Make sure the list of files is empty to start with.

! common/make/JavaCompilation.gmk