shell32/tests: Fix shlexec on Vista and higher

[Ge van Geldorp]

See http://www.winehq.org/pipermail/wine-devel/2009-September/078867.html
I tried a few different approaches to fix the DDE tests, hooking
WaitForInputIdle looked like the best solution to me.

Changelog:
  shell32/tests: Fix shlexec on Vista and higher

---
 dlls/shell32/tests/shlexec.c |  370
++++++++++++++++++++++++++++++------------
 1 files changed, 266 insertions(+), 104 deletions(-)



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