[CMake] include fin_package(qt4) more than once

[Clinton Stimpson]

Jorge Morales wrote:
> I have many projects and some of them need Qt. I want to include the 
> qt directories only on those projects. is ok to add a find_package 
> into each project?
>
Yes, its perfectly find to do that.

Another option, if each of those projects are not independent, is to do 
one find_package(Qt4) at the top, then only include the ${QT_USE_FILE} 
on those projects that need Qt.

Clint