FLTKConfig.cmake and others have been installed in arch dependent LIBDIR,
but should be in arch independent DATADIR. The result is that you can
always find FLTKConfig.cmake in <prefix>/share/fltk.
This is where "/path/to/fltk" should point to when FLTK is used in external
projects (see README.CMake.txt).
Todo: test if find_package works w/o defining FLTK_DIR when installed
in a standard location.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10682 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
