Missing cmake check for Xrender

[Allen Winter]

On Sunday 01 February 2009 4:56:17 pm Alexander Neundorf wrote:
> On Thursday 29 January 2009, Allen Winter wrote:
> ...
> > Ok, I took care of this.
> > kfilepreviewgenerator can now build with or without Xrender.
> > And the kdelibs CMakeLists.txt will print a logging message about Xrender
> > discovery.
> 
> In kdelibs/kfile/CMakeLists.txt ? 
> I don't see it a test (except the one for linking).
> 
In kdelibs/CMakeLists.txt.

I put it there because there are several places in kdelibs that need Xrender.

I also backported to 4.2.