asm optimization for 8bpp (no mmx)

wrlib/view.c

@@ -49,10 +49,13 @@ int main(int argc, char **argv)
 	img = RScaleImage(img, img->width*atof(argv[2]), 
 			  img->height*atof(argv[2]));
     }
+    {int i;
+    for (i=0; i<10;i++)
     if (!RConvertImage(ctx, img, &pix)) {
 	puts(RMessageForError(RErrorCode));
 	exit(1);
     }
+    }
     
     printf("%ix%i\n", img->width, img->height);