[use] Switch Sinhala to USE

Breaks stuff.  Just a start.

https://github.com/harfbuzz/harfbuzz/issues/1044
https://github.com/harfbuzz/harfbuzz/issues/1182
diff --git a/src/hb-ot-shape-complex.hh b/src/hb-ot-shape-complex.hh
index a48a38a..e7990d6 100644
--- a/src/hb-ot-shape-complex.hh
+++ b/src/hb-ot-shape-complex.hh
@@ -264,9 +264,6 @@
     case HB_SCRIPT_TAMIL:
     case HB_SCRIPT_TELUGU:
 
-    /* Unicode-3.0 additions */
-    case HB_SCRIPT_SINHALA:
-
       /* If the designer designed the font for the 'DFLT' script,
        * (or we ended up arbitrarily pick 'latn'), use the default shaper.
        * Otherwise, use the specific shaper.
@@ -295,7 +292,7 @@
 
     /* Unicode-3.0 additions */
     //case HB_SCRIPT_MONGOLIAN:
-    //case HB_SCRIPT_SINHALA:
+    case HB_SCRIPT_SINHALA:
 
     /* Unicode-3.2 additions */
     case HB_SCRIPT_BUHID: