comctl32: Create a point from index function and use it.

[Mike McCormack]

---

This shouldn't change any functionality, but is a step towards using NxM 
  (instead of Nx1) tiling in the imagelist DIB section.  (bug #3573)

  dlls/comctl32/imagelist.c |  108 
++++++++++++++++++++++++++------------------
  1 files changed, 64 insertions(+), 44 deletions(-)
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