ole32: Create a dummy window for use in the drag and drop API tests.

[Rob Shearman]

As a window being registered for drag and drop is a system-global
property, the tests could be affected by other processes in the
system.

Therefore, make the tests more robust by creating a dummy window that
is known to not be registered for drag and drop.
---
 dlls/ole32/tests/dragdrop.c |   36 +++++++++++++++++++++++++++++++-----
 1 files changed, 31 insertions(+), 5 deletions(-)

Hopefully, should fix these failures:
http://test.winehq.org/data/c425c8a406669fc203a8f77ca3be5216fa4e4160/xp_fg-winxp-sp1/ole32:dragdrop.html

However, it seems to be a generally good thing to do without
confirming that it does fix them.
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