use the COMPOSITIONSTRING in hCompStr

[Aric Stewart]

stop using our custom structure for the Composition string and instead 
use the COMPOSITIONSTRING whose handle is in the IMC structure.
---
  dlls/imm32/imm.c |  664 
++++++++++++++++++++++++++++++++++++++----------------
  1 files changed, 469 insertions(+), 195 deletions(-)
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