Clean up list of Unicode scripts

Rename HB_SCRIPT_CANADIAN_ABORIGINAL to HB_SCRIPT_CANADIAN_SYLLABICS
and a macro for the old name.
diff --git a/test/api/test-unicode.c b/test/api/test-unicode.c
index 96c61dd..88f12e7 100644
--- a/test/api/test-unicode.c
+++ b/test/api/test-unicode.c
@@ -351,7 +351,7 @@
   {   0x07B1, HB_SCRIPT_THAANA },
   {   0x0E31, HB_SCRIPT_THAI },
   {   0x0FD4, HB_SCRIPT_TIBETAN },
-  {   0x1401, HB_SCRIPT_CANADIAN_ABORIGINAL },
+  {   0x1401, HB_SCRIPT_CANADIAN_SYLLABICS },
   {   0xA015, HB_SCRIPT_YI },
   {   0x1700, HB_SCRIPT_TAGALOG },
   {   0x1720, HB_SCRIPT_HANUNOO },