hg: jigsaw/jigsaw/jdk: Install of already installed module file incorrectly removes

[chris.hegarty at oracle.com]

Changeset: 82cfb0e749f4
Author:    chegar
Date:      2012-05-31 08:07 +0100
URL:       http://hg.openjdk.java.net/jigsaw/jigsaw/jdk/rev/82cfb0e749f4

Install of already installed module file incorrectly removes
Reviewed-by: alanb, mchung

! src/share/classes/org/openjdk/jigsaw/SimpleLibrary.java
! test/org/openjdk/jigsaw/cli/jmod-basic.sh