qtsvg: Disable framebuffer example for dynamic gl builds

Examples relying on OpenGL 1.x cannot be used in dynamic OpenGL builds.
Therefore we just disable them, like in ES builds.

Change-Id: Ifdd773f4aa4dc317fad1912b40991e129ded05d9
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>