shlwapi: Implement SHSendMessageBroadcastA/W [try #3]

[Detlef Riekenberg]

Native inetcpl crash, when setting a new Homepage.
(inetcpl need also URLSubRegQueryA and ParseURLFromOutsideSourceW)

MSDN documented, that SHSendMessageBroadcast is an equivalent of
SendMessage(HWND_BROADCAST,...)
http://msdn.microsoft.com/en-us/library/bb759883(VS.85).aspx
 
v1:
Implement SHSendMessageBroadcastW


v2:
Added SHSendMessageBroadcastA in the same Patch as suggested by Dmitry

v3:
Replaced SendMessage with SendMessageTimeout
(with the help of: grep HWND_BROADCAST dlls/*/*)

-- 
 
By by ... Detlef

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