configure checks for XComposite, XFixes

[Stefan Nikolaus]

Hi,

I want to add thumbnail support to kicker, which is based on XComposite, 
XFixes and XRender. For the latter there's already a test. The attached patch 
adds checks for the remaining extensions. As I'm not very familiar with the 
automagic stuff, could an auto-Houdini have a look at it, please?

Thanks in advance,
Stefan
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