libgstfft not handled by code generator

We get these warning when running ninja to generate code:

Warning: <attr path="/api/namespace/struct[@cname='GstFFTF32']/method[@cname='gst_fft_f32_fft']"/> matched no nodes
Warning: <attr path="/api/namespace/struct[@cname='GstFFTF32']/method[@cname='gst_fft_f32_window']"/> matched no nodes
Warning: <attr path="/api/namespace[@name='GstFft']"/> matched no nodes
Warning: <attr path="/api/namespace[@name='GstRiff']"/> matched no nodes
Warning: <attr path="/api/namespace[@name='Gst.FFT']"/> matched no nodes
Warning: <attr path="/api/namespace[@name='Gst.Riff']"/> matched no nodes
Warning: <attr path="//struct[@cname='GstControlPoint']"/> matched no nodes
Warning: <attr path="/api/namespace/struct[@cname='GstMIKEYPayloadrand']/field[@cname='rand']"/> matched no nodes
Warning: <attr path="/api/namespace/struct[@cname='gstmikeypayloadT']/field[@cname='ts_value']"/> matched no nodes
Warning: <attr path="//boxed[@cname='GstMpegtsDescriptor']//method[parameters/parameter[@type='GArray***']]"/> matched no nodes

See !12 (merged) .