Minor

Should be enough to get -hangul.cc out of SOURCES in Firefox build:
https://dxr.mozilla.org/mozilla-central/source/gfx/harfbuzz/src/moz.build

No one else should care!

src/hb-ot-shape-complex-hangul.cc

@@ -32,7 +32,7 @@
 
 /* Same order as the feature array below */
 enum {
-  NONE,
+  _JMO,
 
   LJMO,
   VJMO,