Update UCDN to upstream commit 8af93f30

This adds support for Unicode 8.0 and fixes a bug with wrong properties
for ranges of codepoints.

src/hb-ucdn.cc

@@ -148,6 +148,12 @@ static const hb_script_t ucdn_script_translate[] =
     HB_SCRIPT_SIDDHAM,
     HB_SCRIPT_TIRHUTA,
     HB_SCRIPT_WARANG_CITI,
+    HB_SCRIPT_AHOM,
+    HB_SCRIPT_ANATOLIAN_HIEROGLYPHS,
+    HB_SCRIPT_HATRAN,
+    HB_SCRIPT_MULTANI,
+    HB_SCRIPT_OLD_HUNGARIAN,
+    HB_SCRIPT_SIGNWRITING,
 };
 
 static hb_unicode_combining_class_t

src/hb-ucdn/ucdn.h

@@ -191,6 +191,12 @@ typedef unsigned __int64 uint64_t;
 #define UCDN_SCRIPT_SIDDHAM 123
 #define UCDN_SCRIPT_TIRHUTA 124
 #define UCDN_SCRIPT_WARANG_CITI 125
+#define UCDN_SCRIPT_AHOM 126
+#define UCDN_SCRIPT_ANATOLIAN_HIEROGLYPHS 127
+#define UCDN_SCRIPT_HATRAN 128
+#define UCDN_SCRIPT_MULTANI 129
+#define UCDN_SCRIPT_OLD_HUNGARIAN 130
+#define UCDN_SCRIPT_SIGNWRITING 131
 
 #define UCDN_GENERAL_CATEGORY_CC 0
 #define UCDN_GENERAL_CATEGORY_CF 1