bug#879: 23.0.60; startup warning & redisplay noisy

[Kevin Yu]

     Two bugs:
     1. ntemacs will show the following warning message when starting up.
           Emergency (alloc): Warning: past 85% of memory limit

      2. There are lots of noisy points on the screen when you trigger Ctrl-H i. (screenshot
      attached).
           I have tried font: Consolas, Monaco. It's much more noticeable if you are using
        Monaco(http://www.gringod.com/wp-upload/MONACO.TTF).
       
      Best wishes
                                                                                        Kevin

noisy1.png
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noisy2.png
Description: PNG image