[HarfBuzz] Regression test Gujarati(0.9.5 VS 0.9.14)

[datao zhang]

Hi all: After compared the output, I find  if virama following ra, the ligature not formed, ex:(ha,virama,ra,virama), the first virama should be moved after ra and the sequence should become (ha,ra,virama,virama), then vattu formed by (ra,virama), then (ha, vattu) should form ligature, then the last virama applied to the ligature. See attachment to find difference.  

 
 
 
  હ્ર્
  ha,virama,ra,virama
 
 
  
  
 
 
  પ્ર્
  pa,virama,ra,virama
 
 
  ધ્ર્
  dha,virama,ra,virama
 

 Br,Dean  		 	   		  
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