app: Remove COWSHOW debug output

It's 12 years old and will become even more obsolete when we port GIMP
to GEGL.

app/paint-funcs/paint-funcs.c

@@ -1967,9 +1967,6 @@ copy_region (PixelRegion *src,
 {
   gpointer pr;
 
-#ifdef COWSHOW
-  fputc ('[',stderr);
-#endif
   for (pr = pixel_regions_register (2, src, dest);
        pr != NULL;
        pr = pixel_regions_process (pr))
@@ -1983,9 +1980,6 @@ copy_region (PixelRegion *src,
           src->h  == tile_eheight (src->curtile) &&
           dest->h == tile_eheight (dest->curtile))
         {
-#ifdef COWSHOW
-          fputc('!',stderr);
-#endif
           tile_manager_map_over_tile (dest->tiles,
                                       dest->curtile, src->curtile);
         }
@@ -1996,10 +1990,6 @@ copy_region (PixelRegion *src,
           gint          h      = src->h;
           gint          pixels = src->w * src->bytes;
 
-#ifdef COWSHOW
-          fputc ('.',stderr);
-#endif
-
           while (h --)
             {
               memcpy (d, s, pixels);
@@ -2009,11 +1999,6 @@ copy_region (PixelRegion *src,
             }
         }
     }
-
-#ifdef COWSHOW
-  fputc (']',stderr);
-  fputc ('\n',stderr);
-#endif
 }
 
 void