[CMake] check_include_file macro

[Bill Hoffman]

Steven Van Ingelgem wrote:
> Would it solve my problem if (in my case) I set HAS_UUID_H to NOTFOUND?
> 

No, I could not find a way to remove or change the cache entry.  If you 
want to use a compiler check like this, you option would be to copy the 
check_include_file macro into your project and change the outer if logic 
to handle the notfound case.  find_path should just work.

-Bill