Original commit message from CVS:
* gst/base/Makefile.am:
* gst/base/gstadapter.c: (gst_adapter_base_init),
(gst_adapter_class_init), (gst_adapter_init),
(gst_adapter_dispose), (gst_adapter_finalize), (gst_adapter_new),
(gst_adapter_clear), (gst_adapter_push), (gst_adapter_peek),
(gst_adapter_flush), (gst_adapter_available),
(gst_adapter_available_fast):
* gst/base/gstadapter.h:
Ported and added adapter to the base classes.