harfbuzz: check in harfbuzz-ng, add gyp define to use it

third_party/harfbuzz-ng/COPYING

Index: third_party/harfbuzz-ng/COPYING
diff --git a/third_party/harfbuzz-ng/COPYING b/third_party/harfbuzz-ng/COPYING
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+HarfBuzz is licensed under the so-called "Old MIT" license.  Details follow.
+
+Copyright (C) 2010  Google, Inc.
+Copyright (C) 2006  Behdad Esfahbod
+Copyright (C) 2009  Keith Stribley
+Copyright (C) 2009  Martin Hosken and SIL International
+Copyright (C) 2007  Chris Wilson
+Copyright (C) 2004,2007,2008,2009,2010  Red Hat, Inc.
+Copyright (C) 1998-2004  David Turner and Werner Lemberg
+For full copyright notices consult the individual files in the package.
+
+
+Permission is hereby granted, without written agreement and without
+license or royalty fees, to use, copy, modify, and distribute this
+software and its documentation for any purpose, provided that the
+above copyright notice and the following two paragraphs appear in
+all copies of this software.
+
+IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+
+THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.