hg: jdk9/sandbox: 8176785: Add build support to generate PNG file from .dot file

[chris.hegarty at oracle.com]

Changeset: 0bf994fa4ee5
Author:    ihse
Date:      2017-04-19 10:44 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/0bf994fa4ee5

8176785: Add build support to generate PNG file from .dot file
Reviewed-by: erikj, mchung

! make/Help.gmk
! make/Javadoc.gmk
! make/Main.gmk
! make/common/Modules.gmk
+ make/devkit/createGraphvizBundle.sh