Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh

Index: third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh
diff --git a/third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh b/third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh
index 49056e67691d2f3158ab6740425074140475b18e..a9606b3d27f01da2e8ddf99d66f16cf536294526 100644
--- a/third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh
+++ b/third_party/harfbuzz-ng/src/hb-ot-hmtx-table.hh
@@ -44,8 +44,8 @@ namespace OT {
 
 struct LongMetric
 {
-  USHORT	advance; /* Advance width/height. */
-  SHORT		lsb; /* Leading (left/top) side bearing. */
+  UFWORD	advance; /* Advance width/height. */
+  FWORD		lsb; /* Leading (left/top) side bearing. */
   public:
   DEFINE_SIZE_STATIC (4);
 };
@@ -74,7 +74,7 @@ struct _mtx
 					 * be in the array, but that entry is
 					 * required. The last entry applies to
 					 * all subsequent glyphs. */
-  SHORT		leadingBearingX[VAR];	/* Here the advance is assumed
+  FWORD		leadingBearingX[VAR];	/* Here the advance is assumed
 					 * to be the same as the advance
 					 * for the last entry above. The
 					 * number of entries in this array is