[CMake] FIND_LIBRARY - always true - very strange...

[Peter Vanroose]

> The idea of the cache is to save information that may not be easy to 
> find.  Say for example the library cannot be found automatically at
> all because it is installed in some strange location.

What I'm doing for my dashboard builds, is just write those few lines
(10 or so) to an otherwise empty CMakeCache.txt in an otherwise empty
build tree. Then start the build. All other auto-configured variables
are then added to that file.