Check if we are creating a static library before a framework.

Check if we are creating a static library before a framework.

Even if we are building frameworks, we still build some static
libraries (eg QtUiTools). Static libraries are never in frameworks
so we need to ensure that we don't generate a path to a framework
in the CMake config file in that case.

Change-Id: I533e30874a653695cb0e262617e71bbd3d4c954b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>