Use GstClockTime in _get_state() instead of GTimeVal.

Use GstClockTime in _get_state() instead of GTimeVal.

Original commit message from CVS:
* check/gst/gstbin.c: (GST_START_TEST):
* check/gst/gstelement.c: (GST_START_TEST):
* check/gst/gstevent.c: (GST_START_TEST), (test_event):
* check/gst/gstghostpad.c: (GST_START_TEST):
* check/gst/gstpipeline.c: (GST_START_TEST):
* check/pipelines/simple_launch_lines.c: (run_pipeline):
* check/states/sinks.c: (GST_START_TEST):
* gst/elements/gsttypefindelement.c: (stop_typefinding):
* gst/gstbin.c: (gst_bin_provide_clock_func), (gst_bin_add_func),
(gst_bin_remove_func), (gst_bin_get_state_func),
(gst_bin_recalc_state), (gst_bin_change_state_func),
(bin_bus_handler):
* gst/gstelement.c: (gst_element_get_state_func),
(gst_element_get_state), (gst_element_abort_state),
(gst_element_commit_state), (gst_element_set_state),
(gst_element_change_state), (gst_element_change_state_func):
* gst/gstelement.h:
* gst/gstpipeline.c: (gst_pipeline_class_init), (do_pipeline_seek),
(gst_pipeline_provide_clock_func):
* gst/gstutils.c: (gst_element_link_pads_filtered):
* tools/gst-launch.c: (main):
* tools/gst-typefind.c: (main):
Use GstClockTime in _get_state() instead of GTimeVal.
Remove old code in gstutils.c