[oe] CMake and Qt4

[Matthew Dombroski]

>
> This will not work when both qt4x11 and qt4e is built and staged. I have no
> specific knowledge of the current FindQt4 cmake module but there should be a
> way to tell it that we want the QtE, QtX11 or QtMac built...
>
> Do you have any idea?
>    
Do you know the naming convention of qt4x11?
qt4e names libs with a big E like this: libQtCoreE.so.4.5

It shouldnt be hard to add another variable in FindQt4.cmake that 
controls what names we search for.

~Matt