* src/cache/ftccmap.c (FTC_CMapCache_Lookup): Avoid `FT_Set_Charmap`.

Set charmap aggressively without all validations of `FT_Set_Charmap`
because we take it from the available array and only temporarily.
Even CMap Format 14 will gracefully return 0.

src/cache/ftccmap.c

@@ -297,19 +297,17 @@
 
       if ( cmap_index < face->num_charmaps )
       {
-        FT_CharMap  old, cmap  = NULL;
+        FT_CharMap  old  = face->charmap;
+        FT_CharMap  cmap = face->charmaps[cmap_index];
 
 
-        old  = face->charmap;
-        cmap = face->charmaps[cmap_index];
-
-        if ( old != cmap && !no_cmap_change )
-          FT_Set_Charmap( face, cmap );
+        if ( !no_cmap_change )
+          face->charmap = cmap;
 
         gindex = FT_Get_Char_Index( face, char_code );
 
-        if ( old != cmap && !no_cmap_change )
-          FT_Set_Charmap( face, old );
+        if ( !no_cmap_change )
+          face->charmap = old;
       }
 
       FTC_CMAP_NODE( node )->indices[char_code -