msi: Rewrite the second loop in ACTION_FinishCustomActions so that it always terminates.

[Robert Shearman]

Create an array of handles to wait on so that we can wait without 
holding a critical section.
---
  dlls/msi/custom.c |   33 +++++++++++++++++----------------
  1 files changed, 17 insertions(+), 16 deletions(-)
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