ext/alsa/: Re-commit ALSA switches.

ext/alsa/: Re-commit ALSA switches.

Original commit message from CVS:
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_build_list):
* ext/alsa/gstalsamixertrack.c: (gst_alsa_mixer_track_new):
Re-commit ALSA switches.
* gst/adder/gstadder.c: (gst_adder_loop):
64-bit fix (#151416).
* gst/debug/progressreport.c: (gst_progressreport_report):
64-bit fix (#151419).
* gst/matroska/matroska-demux.c:
(gst_matroska_demux_parse_contents):
64-bit fix (#151420).
* gst/playback/test3.c: (update_scale):
64-bit fix (#151421).