[subset] Subset vmtx if present.

src/hb-ot-hmtx-table.hh

@@ -264,7 +264,7 @@ struct hmtxvmtx
       {
         advance += (font->num_coords ? var_table->get_advance_var (glyph, font->coords, font->num_coords) : 0); // TODO Optimize?!
       }
-      return advance;	        
+      return advance;
     }
 
     public:

src/hb-subset.cc

@@ -252,6 +252,9 @@ _subset_table (hb_subset_plan_t *plan,
     case HB_OT_TAG_hmtx:
       result = _subset<const OT::hmtx> (plan);
       break;
+    case HB_OT_TAG_vmtx:
+      result = _subset<const OT::vmtx> (plan);
+      break;
     case HB_OT_TAG_maxp:
       result = _subset<const OT::maxp> (plan);
       break;