configure.ac: say what CHECK flags we use

configure.ac: say what CHECK flags we use

Original commit message from CVS:

* configure.ac:
say what CHECK flags we use
* docs/libs/gstreamer-libs.types:
* libs/gst/controller/Makefile.am:
* libs/gst/controller/gst-controller.c:
* libs/gst/controller/gst-controller.h:
* libs/gst/controller/gst-helper.c:
* libs/gst/controller/gst-interpolation.c:
* libs/gst/controller/gstcontroller.c:
* libs/gst/controller/gsthelper.c:
* libs/gst/controller/gstinterpolation.c:
* tools/gst-inspect.c: (print_plugin_info):
we don't use dashes in header names