KDEWIN32 Must be found

[Brad King]

Bill Hoffman wrote:
> We need to add something like this to FindKDE4.cmake:
> 
>   FIND_PACKAGE(KDEWIN32 REQUIRED)
>    IF(NOT KDEWIN32_FOUND)
>      MESSAGE(FATAL_ERROR "KDEWIN32 must be found, or try compile results will be incorrect, make sure kdewin32 is built and installed.")
>    ENDIF(NOT KDEWIN32_FOUND)
>      
> 
> The problem is that if you do not find KDEWIN32, all the try compile results will fail.
> With this extra check, CMake will stop processing immediately, and not get any bad
> answers for the try compile results.   Once you get the wrong answers, you have to delete
> the CMakeCache.txt file.  If we do this, then you can specify KDEWIN32 with the cmake GUI,
> and continue to configure.

I've updated FindKDEWIN32.cmake to send a FATAL_ERROR if KDEWIN32 is 
required but not found.  It looks like the FIND_PACKAGE call in 
FindKDE4.cmake already says the package is required.

-Brad