[Lazarus] [lazarus] Patch for processing WM_COPYDATA in Win32 / BugID 9210

[Christian U.]

> Maybe Win32Widgetset.AllowMessage('WM_COPYDATA') ?
>   
I think this makes the Interface much more complex and for what ?
Maybe this discussion happens for again 2-3 Messages. I dont think that 
it will be more.
The overhead of these 2-3 real importand messages that are passed to the 
LCL is minimal.
Also makes no sense to try to make some crossplatform stuff of them they 
have to exist only in win32.
Lazarus can,must and is not 100% cross plattform.

best regards
Christian