user32: Use LoadLibrary and LoadImage to extract icons from wine's built-in dlls in PrivateExtractIcons

[Michael Jung]

Hi Alexandre,

This patch is based on your comment in:
http://www.winehq.org/pipermail/wine-devel/2005-August/039466.html

Changelog:
	- Try LoadLibrary/LoadImage to extract icons from wine's built-in dlls if 
SearchPath fails to find the requested file in PrivateExtractIcons
	- Some unit tests for PrivateExtractIcons

Bye,
-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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