usp10: correct issues if a feature tag is duplicated between GSUB and GPOS

[Aric Stewart]

Identified by Huw Davies
---
 dlls/usp10/opentype.c       |   23 +++++++++++++++++++----
 dlls/usp10/shape.c          |   38 +++++++++++++++++++-------------------
 dlls/usp10/usp10_internal.h |    7 ++++++-
 3 files changed, 44 insertions(+), 24 deletions(-)


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