Behdad Esfahbod 6c83fe4846 Really fix SingleSubst delta math
I had broken this in e06166b83aa82582dab2e011520b1a77f72aa9f9.

Fix that, and other issues.  Since I made that last commit, it has
become clear that SingleSubst works by adding delta and then doing
module 65536.

HarfBuzz was updated for this in 2011:
commit 52ebdff49d13f239efc886de935d47be9860f6e5
Author: Behdad Esfahbod <behdad@behdad.org>
Date:   Tue Sep 27 12:38:16 2011 -0400

    Fix GSUB lookuptype 1 subtype 1 delta wrapping
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