configure.ac: Put DEFAULT_AUDIOSINK in config.h and use whereever possible. (Fixes...

configure.ac: Put DEFAULT_AUDIOSINK in config.h and use whereever possible.  (Fixes #165997)

Original commit message from CVS:
* configure.ac: Put DEFAULT_AUDIOSINK in config.h and use
whereever possible.  (Fixes #165997)
* examples/capsfilter/capsfilter1.c: (main):
* examples/dynparams/filter.c: (create_ui):
* examples/seeking/cdparanoia.c: (get_track_info), (main):
* examples/seeking/chained.c: (main):
* examples/seeking/seek.c: (make_mod_pipeline), (make_dv_pipeline),
(make_wav_pipeline), (make_flac_pipeline), (make_sid_pipeline),
(make_vorbis_pipeline), (make_mp3_pipeline), (make_avi_pipeline),
(make_mpeg_pipeline), (make_mpegnt_pipeline):
* examples/seeking/spider_seek.c: (make_spider_pipeline):
* examples/switch/switcher.c: (main):
* ext/dv/demo-play.c: (main):
* ext/faad/gstfaad.c: (gst_faad_change_state):
* ext/mad/gstmad.c: (gst_mad_chain):
* ext/smoothwave/demo-osssrc.c: (main):
* gst-libs/gst/gconf/gconf.c: (gst_gconf_set_string),
(gst_gconf_render_bin_from_description),
(gst_gconf_get_default_audio_sink),
(gst_gconf_get_default_video_sink),
(gst_gconf_get_default_audio_src),
(gst_gconf_get_default_video_src),
(gst_gconf_get_default_visualization_element):
* gst/level/demo.c: (main):
* gst/level/plot.c: (main):
* gst/playback/gstplaybin.c: (gen_video_element),
(gen_audio_element):
* gst/playback/test.c: (gen_video_element), (gen_audio_element):
* gst/playondemand/demo-mp3.c: (setup_pipeline):
* gst/sine/demo-dparams.c: (main):
* gst/spectrum/demo-osssrc.c: (main):
* gst/speed/demo-mp3.c: (main):
* gst/volume/demo.c: (main):
* testsuite/embed/embed.c: (main):