gst/gstutils.*: API: Deprecate gst_atomic_int_set(), g_atomic_int_set() should be used now that we depend on new enou...

Original commit message from CVS:
* gst/gstutils.c:
* gst/gstutils.h:
API: Deprecate gst_atomic_int_set(), g_atomic_int_set() should be used
now that we depend on new enough GLib.
* gst/gstcaps.c: (gst_static_caps_get):
* gst/gstclock.c: (gst_clock_entry_new):
* gst/gstinfo.c: (_gst_debug_init), (gst_debug_set_colored),
(gst_debug_set_default_threshold), (_gst_debug_category_new),
(gst_debug_category_set_threshold):
* libs/gst/base/gstbasesink.c: (gst_base_sink_init),
(gst_base_sink_set_qos_enabled):
* libs/gst/net/gstnettimeprovider.c:
(gst_net_time_provider_set_property):
Use g_atomic_int_set() instead of gst_atomic_int_set().