usp10: correct glyph caching beyond the BMP

[Aric Stewart]

A fix for Bug 30818
---
  dlls/usp10/usp10.c          |   23 ++++++++++++++++++-----
  dlls/usp10/usp10_internal.h |    6 +++++-
  2 files changed, 23 insertions(+), 6 deletions(-)


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