Cosmetic: Rename HB_LIKELY/HB_UNLIKELY to likely/unlikely

src/hb-unicode.c

diff --git a/src/hb-unicode.c b/src/hb-unicode.c
index b75fe7e..fce79e6 100644
--- a/src/hb-unicode.c
+++ b/src/hb-unicode.c
@@ -294,7 +294,7 @@
 HB_INTERNAL hb_direction_t
 _hb_script_get_horizontal_direction (hb_script_t script)
 {
-  if (HB_UNLIKELY ((unsigned int) script >= ARRAY_LENGTH (horiz_dir)))
+  if (unlikely ((unsigned int) script >= ARRAY_LENGTH (horiz_dir)))
     return HB_DIRECTION_LTR;
 
   return horiz_dir[script];