Fix enum nicks; only emit no-more-pads once; add support for very fast encoding mode...

Fix enum nicks; only emit no-more-pads once; add support for very fast encoding mode in upcoming 4.40.0 release (#369...

Original commit message from CVS:
Patch by: Sebastian Dröge <slomo at circular-chaos.org>
* configure.ac:
* ext/wavpack/gstwavpackenc.c: (gst_wavpack_enc_mode_get_type),
(gst_wavpack_enc_correction_mode_get_type),
(gst_wavpack_enc_joint_stereo_mode_get_type),
(gst_wavpack_enc_init), (gst_wavpack_enc_set_wp_config):
Fix enum nicks; only emit no-more-pads once; add support for very
fast encoding mode in upcoming 4.40.0 release (#369539).