[HarfBuzz] Post Base Substitution fails with Malayalam repha

[Suresh P]

Hi,

It seems that the post base substitutions is not happening with 
Malayalam reph. The uukara ligature glyph (used traditional Malayalam 
lipi) substitution via post base ligature lookup should happen prior to 
the reordering of the reph glyph. A test case for the word 'പാൎക്കുക' is 
attached.

-suresh
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