FindQCA2.cmake changes

[Michel Hermier]

Hi,
Here are my changes to make FindQCA2.cmake working for me (the path were 
broken for me).
I changed it so it follows what other find scripts do:
 - using the cache (don't know if it's rigth to do so)
 - Check the presence of the libraries for dynamic compilation instead 
of relying on pkg-config only (maybe this also fix things on WIN32, I 
don't really know)

Comments or OK to commit ?

Cheers,
    Michel


Note: added both the diff and the final file since the diff is almost 
unreadable due to indent.
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