Remove HB_TAG_CHAR4
diff --git a/src/hb-common.cc b/src/hb-common.cc
index 2f9b3b8..5c4a2c7 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -85,7 +85,7 @@
   for (; i < 4; i++)
     tag[i] = ' ';
 
-  return HB_TAG_CHAR4 (tag);
+  return HB_TAG (tag[0], tag[1], tag[2], tag[3]);
 }
 
 /**