FindKDE4Internal.cmake: better rpath handling

[Rex Dieter]

Alexander Neundorf wrote:

>> 2.  copy-n-paste the aforementioned code all over (similiar to what's
>> already in FindKDEInternal)
>>
>>
>> 3.  wait for cmake to handle this better natively
> 
> I think it's option 3.

How about compromise 2+3 ? :)

Since no 2 means folks in my situation (a packager who doesn't want 
superfluous rpaths floating around), will need to always patch stuff.

-- Rex