Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-open-type-private.hh

Index: third_party/harfbuzz-ng/src/hb-open-type-private.hh
diff --git a/third_party/harfbuzz-ng/src/hb-open-type-private.hh b/third_party/harfbuzz-ng/src/hb-open-type-private.hh
index 482ef3469d6f99d31930562985a5f0e2df52990a..80ad68774673b676036737d0b36e17144a88bed6 100644
--- a/third_party/harfbuzz-ng/src/hb-open-type-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-open-type-private.hh
@@ -662,6 +662,15 @@ typedef SHORT FWORD;
 /* 16-bit unsigned integer (USHORT) that describes a quantity in FUnits. */
 typedef USHORT UFWORD;
 
+/* 16-bit signed fixed number with the low 14 bits of fraction (2.14). */
+struct F2DOT14 : SHORT
+{
+  //inline float to_float (void) const { return ???; }
+  //inline void set_float (float f) { v.set (f * ???); }
+  public:
+  DEFINE_SIZE_STATIC (2);
+};
+
 /* Date represented in number of seconds since 12:00 midnight, January 1,
  * 1904. The value is represented as a signed 64-bit integer. */
 struct LONGDATETIME