hg: valhalla/valhalla/langtools: Fix build problem with genstubs step trying to (incorrectly) mock a functional interface

[maurizio.cimadamore at oracle.com]

Changeset: a82e61eca30b
Author:    mcimadamore
Date:      2014-07-17 11:00 +0100
URL:       http://hg.openjdk.java.net/valhalla/valhalla/langtools/rev/a82e61eca30b

Fix build problem with genstubs step trying to (incorrectly) mock a functional interface

! make/GenstubsLangtools.gmk