Ignore T & U when determining the joining scripts

src/gen-arabic-joining-list.py

@@ -54,6 +54,8 @@ def read_joining_uu (f):
 		fields = [x.strip () for x in line.split (';')]
 		if len (fields) == 1:
 			continue
+		if fields[2] in {'T', 'U'}:
+			continue
 
 		values.add (int (fields[0], 16))
 

src/hb-ot-shape-complex-arabic-joining-list.hh

@@ -25,7 +25,6 @@ has_arabic_joining (hb_script_t script)
     case HB_SCRIPT_ARABIC:
     case HB_SCRIPT_CHORASMIAN:
     case HB_SCRIPT_HANIFI_ROHINGYA:
-    case HB_SCRIPT_KAITHI:
     case HB_SCRIPT_MANDAIC:
     case HB_SCRIPT_MANICHAEAN:
     case HB_SCRIPT_MONGOLIAN: