libs/gst/base/gstbasesrc.*: Name (private) union; makes Sun's Forte compiler happy...

libs/gst/base/gstbasesrc.*: Name (private) union; makes Sun's Forte compiler happy (#324900).

Original commit message from CVS:
Reviewed by: Tim-Philipp Müller  <tim at centricular dot net>
* libs/gst/base/gstbasesrc.c: (gst_base_src_init),
(gst_base_src_perform_seek), (gst_base_src_send_event),
(gst_base_src_set_property), (gst_base_src_get_property),
(gst_base_src_loop), (gst_base_src_start),
(gst_base_src_activate_push):
* libs/gst/base/gstbasesrc.h:
Name (private) union; makes Sun's Forte compiler happy (#324900).