Original commit message from CVS:
* gst/Makefile.am:
* gst/common.h:
* gst/pbutils.defs:
* gst/pbutils.override:
* gst/pbutilsmodule.c: (initpbutils):
new gst.pbutils module that wraps the gst-plugins-base pbutils
helper library.
* testsuite/Makefile.am:
* testsuite/common.py:
* testsuite/test_pbutils.py:
Test case for gst.pbutils
Fixes #472822