gdi32: use usp10 to optionally generate glyphs for bidi strings

[Aric Stewart]

allows us to be able to make use of the mirroring code and eventually 
the shaping code when it is in place.
---
  dlls/gdi32/bidi.c        |  184 
+++++++++++++++++++++++++++++++++-------------
  dlls/gdi32/font.c        |   15 ++--
  dlls/gdi32/gdi_private.h |    4 +-
  3 files changed, 142 insertions(+), 61 deletions(-)


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