[KERNEL32] Factor out all kernel32 timeout-conversion snippets to one helper functions

[Andrey Turkin]

Also there are simple fix for SleepEx to not implicitely convert from 
NTSTATUS to error return value (I think the fix is too small/trivial to 
split it out)
---
  dlls/kernel32/sync.c |   66 
++++++++++++++++++++-----------------------------
  1 files changed, 27 insertions(+), 39 deletions(-)
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