kdebase compilation fails due to missing of _optional_ libxt

[Dmitry Suzdalev]

Hi!

kdebase's trunk fails to build here with an error:

[ 35%] Building CXX object 
workspace/kdesktop/lock/CMakeFiles/kdesktop_lock.dir/lockprocess.o
/home/kde-devel/KDE-SVN/kdebase/workspace/kdesktop/lock/lockprocess.cc:64:27: 
error: X11/Intrinsic.h: No such file or directory

I found out that this header is part of libxt-dev package which I currently 
miss.
But cmake configure step says that it is OPTIONAL:

-- libXt not found - browser plugin support disabled

So I guess right behavior would be:
1. Put some #ifdef to lockprocess.cc
2. Require libxt development headers for building kdebase

Cheers,
Dmitry.