hg: jigsaw/jake/langtools: suppress -sourcepath in internal Ant build

[jonathan . gibbons]

Changeset: 28556ee3299f
Author:    jjg
Date:      2016-03-10 17:26 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/langtools/rev/28556ee3299f

suppress -sourcepath in internal Ant build

! make/build.xml