hg: build-infra/jdk7/jdk: Make sure LIBCXX is used on all C++ libraries.

[fredrik.ohrstrom at oracle.com]

Changeset: 2a2b36aca55e
Author:    ohrstrom
Date:      2011-12-01 17:35 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk7/jdk/rev/2a2b36aca55e

Make sure LIBCXX is used on all C++ libraries.

! make/CompileDemos.gmk
! make/CompileNativeLibraries.gmk