[Lazarus] Clipboard method needed to clear cache

[AlexeyT]

LCL uses clipboard cache to support all clp formats on all OS, even if 
OS don't support some.

In *CudaLister plugin for Total Commander* [based on CudaText parts], I 
need method to clear this cache. Clipboard.Clear is not ok [i need 
contents of OS clp]. Method needed to solve this issue:

https://github.com/Alexey-T/CudaLister/issues/27 (english text also). I 
will call it before reading Clipboard.AsText.

-- 
Regards,
Alexey

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