Original commit message from CVS:

* configure.ac:
figure out where plugins-base plugins are
* tests/check/Makefile.am:
use plugins-base plugins, so we have typefind functions
* tests/check/elements/id3v2mux.c: (test_taglib_id3mux_with_tags):
increase num-buffers, this makes sure the test errors out instead
of timing out when no typefind functions are present