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Stop calling face_text_pos() for faces that don't need to have text in
them anyway. It's slow and pointless.

[originally from svn r9155]

--- a/loopy.c

+++ b/loopy.c

@@ -3735,9 +3735,11 @@

     draw_rect(dr, x, y, w, h, COL_BACKGROUND);

     for (i = 0; i < g->num_faces; i++) {

-        face_text_bbox(ds, g, &g->faces[i], &bx, &by, &bw, &bh);

-        if (boxes_intersect(x, y, w, h, bx, by, bw, bh))

-            game_redraw_clue(dr, ds, state, i);

+        if (state->clues[i] >= 0) {

+            face_text_bbox(ds, g, &g->faces[i], &bx, &by, &bw, &bh);

+            if (boxes_intersect(x, y, w, h, bx, by, bw, bh))

+                game_redraw_clue(dr, ds, state, i);

+        }

     }

     for (phase = 0; phase < NPHASES; phase++) {

         for (i = 0; i < g->num_edges; i++) {